If something catches your eye in a little shop with an unmarked price, decide what you think it's worth to you, offer 50% of that first and gradually offer up in small increments until you get it at the price it's worth to you. No matter what you pay, it probably can be cheaper but seriously, most things are cheap and haggling is a sport in Bali so have fun with it.

Excerpt from one of the better posts I've seen on the Trip Advisor Bali Forum 

Rough Guide to Market prices and Fixed shops  

Watch the zeros in your money 1000 (10c) ,10 000 ($1) ,100 000rp ($10).

If you think it's a fair price, pay it. Don't squabble over small amounts ( an extra 10 000 rp is only $1 )

This is a guide to shopping at the markets though I have also included some of the department stores and popular shops in most areas, for those who love to shop and don’t know where to go.

I have compiled prices from fixed price market shops Rikas in Tuban, Tootsies in Sanur, Ketuts in Legian and Nyomans in Kuta. Some may charge 5000rp more than others. Some things were cheaper, some the same, some dearer.

I did not get to the Homeware shops this trip but if you go to Biarritz inSeminyak, It’s bright, airy, clean and 3 floors of fixed price. It’s sister shop is Geneva and they both have websites to look at their prices and goods. This will give you an idea of what to pay in the markets.

Lastly there are a couple of ladies that have plagiarised this shopping list, please note this is the ORIGINAL and there are severe penalties for doing so.

Back pack surf 75 000rp
Beach towels (Bintang etc) 50 000 rp
Board shorts Mens RP 40 000rp
Bracelets, wide knitted stretch beaded 15 000rp, chunky beaded 25 000rp.
Caps Baseball Peaked RP - 25 000rp
Flags/umbal umbals 25 000rp each + for longer length
Kids Singlets/T shirts RP 20 000 and 30 000rp
Kids board shorts 30 000rp
kids AFL shirts 80 to 100 000rp.
Mens shorts, short pull on 40 000, longer fitted striped surf 80 000rp, Denim surf 110 000rp
Mens dress shirts surf 65 000rp
Mens Collared Stretch Polo shirts RP 60 000rp
Mens AFL Football shirts Collared 120 000rp
Mens T shirts (always buy larger as will shrink) 50 000rp poly cotton 60 000rp cotton and short sleeved Bintang 35 000rp
Mens Long sleeves surf T shirt 70 000rp
Mens Singlets /tank tops poly cotton 40 000 rp to 50 000rp for cotton
Puppets large 100 000rp
Sandals, soft leather 60 000rp
Sarongs Short wrap (basic printed) RP 25 000
Sarongs Long RP 30 000
Shoes / Sandles (dressier, sling backs , suede , studded etc) 85 000rp to 100 000rp
Stubby holders packs of 6 - 30,000 rp
Sunglasses 30 000 rp
Travel cushion 50 000rp
Umbrella / ceremonial 60 000 rp check for borer holes when buying.
Umbrella for rain 45 000rp, 55 000rp
Vans style shoes 100 000rp (bought in Tootsies, some shops ask 150 000rp)
Watches RP 40 000 to 70 000rp (Bagus watch shop more expensive but gorgeous and fixed price)
Wallet mens, branded, Black Leather RP 35 000rp
Wallet ladies , branded, 60 000 rp to 80 000rp for the large

Fixed Price shops

Sanur.

TOOTSIE’S new shop location behind her tootsies bar and café, when you come down Jalan pantai Sindhu, turn left at the beach and it’s 20 meters. Behind her shop, her daughter has opened a spa salon.

There are shops surrounding Tootsies now that do fixed price also.

Jenis shop 28 and 29 Sindhu beach markets behind Bennos.

Hardy’s department store and supermarket and Tina Shop (boutique)

Legian.

Ketuts. Enter Jalan Sahadewa (garlic lane) from Jalan melasti and its the first tiny lane on your right.

Look down and you will see Ketut written....thats when you manage to get past the group of guys on the corner…She has 3 or 4 shops, gives bottles of water and does western sizes (including the correct crutch sizing)….She also sells some homewares, handbags etc….She is always busy so try to go around 9am ish when she is opening.

Or Ketut's "sister" in garlic lane. Between Billys and Suriwathi hotel. Same stuff and same prices. Not crowded as most people don't know it's fixed price. She will get from ketut if she hasn't got.

Also in Legian …from LeeV1

In Legian Markets next to the Mini mart on the corner of Jl Melasti and Garlic Lane..... you will find Anna's Shop, it's down the second aisle off Jl Melasti, If you look up at the signs, hers is pink. Ayu and Wayan, ask for Fixed price and say that Lee sent you.

From Freakybudboy

In Legian art market is Turika . Looks to be just around the vicinity of Ketuts and before Billys bar. Call out for Turika. She is fixed price if you ask.

From Andrea Miss Debbies is also very good located in Garlic lane, about half way down on your right.. Just ask to go out the back and they will take you to the rear compound with lots more stock and set prices, bottled water and no hassle!

Santa's is at the top end of Garlic Lane on the left, about 4 shops before it meets Jl Padma. Number 23c (just past Losari Hotel)

Kuta and surrounds.

at Kuta art markets, looking from kartika plaza entrance towards the beach.......she is down the back left Isle.

Shop 111. Her name is Nyoman and she is lovely. Ask for fixed price. ( her husband is also a driver).

Shop 39 (over towards right middle Isle) wayan is also fixed if you ask.

Mataharis and Kuta square

Ace hardware , at Istana Galleria (Alta Moda fabrics is there too)

Bali mall galleria with another mataharis (near the by pass road)

In Tuban

Down opposite Sun Island hotel are 3 more fixed market shops, Rikas, Jenis and Diannes.

Centro discovery Mall


Seminyak.

3 Fixed price stores for all things market and homewares

Geneva Jl. Raya Kerobokan No. 100

Biarritz on sunset road (lighter and brighter and near carrefores)

Krisna on sunset road (good for t shirts and batik goods)

Bali Brasco for great clothes especially including kids.. is on the Sunset Road, on the opposite side to Carrefour

Carrefores department store

Bintang supermarket (upstairs is also good) (they have the cheapest Bali natural soaps in Bali)

Jalan 66/ double six street, mostly fixed price. Paisal (opposite Scisilia spa) is great for costume jewellery

Silverberry….gorgeous jewellery……on Jalan legian just past Jalan padma (on the right) and up further just before Bintang supermarket (on the left) and in the new Beachwalk shopping centre near poppies 2..

Divine Divas Jl. Laksmana +62 813-3865-4266 Seminyak

Soul Sisters 3 brothers lane Seminyak

Tina shop 3 brothers lane Seminyak.

Erlangga 1 Jl Nusa Kambangan No 28

Bali Zen, near Bali Deli.

Bypass road, 3 factory surf outlets within 150 meters (take a driver, too hard to get a taxi back)

Denpasar.

B Denpasar ph -0361 221 1281 (like Biarritz)

Ramayana dept store

Mataharis (and KFC is on basement if you want a lunch stop)

Robinsons local dept store

Tiara Dewata local dept store

Singaraja/ Lovina

Hardy’s department store

Careforres (nothing like Seminyak)

Five Seminyak Bars just around the corner  I absolutely love for world class bar tending skills, great drinks, and ambiance...

#1 
Topping our list for outstanding bartenders, fun conversation, and a premier cocktail experience iMamasan - up on the second floor. What makes them even more special, they're just up the block from The Shampoo Lounge and our barbershop! Don't let the picture fool you, if you don't have a reservation, good luck getting in! 

#2 
Just down the street from Mamasan is Corner House. The bar is easy to overlook as they don't publicize much and it's up on the second floor. It's a great space to chill for an afternoon while pounding out a fantastic Espresso Martini induced novel. 

#3 
Food Street's old stand bye, the funniest staff in town with the most, um unique uniforms in Bali - Red Carpet Champagne Bar! Grab a bottle of bubby, settle in, there's always a party going on at this place and it starts early enough for old timers to enjoy it! 

#4 
And just across from Red Carpet is La Favela - this place is incredible, decoration and rennovation was a labor of love and they've done a great job recreating a Brazilian Favela experience in Bali. It's a must see so do check it out! We particularly love their Barber chair! 

#5
My personal favorite in Seminyak is Single Malt, the elegance takes me back to old New York, it's a total speakeasy and we're blessed to have them in Bali with their excellent Whiskey and Cigar selection. 

I haven't tried them here but I'd love to here feedback from anyone who has, this sounds like a great option! Uber Bali Link  Let me know! 

Now for something unique that most visitors aren't aware of....

Undoubtedly one of the most unique rooms in Bali is The Bale Sutra room at Tugu hotel. If you're looking for a truly unique Indonesian experience, surrounded by old Indonesia elegance and charm do consider making a reservation here.

Remind the ladies (and yourselves) that they should never ride with an exposed bag of goodies especially if it's 4AM and you're heading home from Skygarden! Thieving fuckers are known to sneak up along side and yank bags off which is pretty much the number one crime against tourists on the island. Most fall as the bag is getting yanked and some have been fatally hurt - so be aware not to tempt in anyway, ride with friends, and keep a low profile. 

Once you get past the Waterbom name, anything with bomb in it makes me tense,  this park is INCREDIBLE. It's definitely one of the most well run large businesses in Bali. The place is clean as a whistle, food is reasonably priced, and the water slides are world class with a broad range of rides that'll appeal to all ages. Personally, I like going there and drifting around Lazy River a few hours and the occasional run to the excellent swim up bar. It's about $35 bucks for foreigners if I recall correctly....

We're proud to provide Bali's only mobile full Barber experience to your venue. Depending on the size of the event and your desires we can send multiple chairs and highly capable, classically attired barbers to your venue, event, or party. It's great fun and besides getting great shaves and haircuts, the photo opportunities are endless. Groomsmen love it! We've done poolside, ocean side, and bar side barbering and it's always been great fun! The event in this video is one we did for Dunhill, Indonesia at the incredible Merah Putih restaurant in Petitenget, Bali. 

Support the local warungs and buy your Bintang's from them....They are a dying breed with all the chain Mini Marts crowding them out with their bright lights and fancy fridges. 

Kite Flying Season is something to behold when competitions are held across the island for most spectacular kits. May is best for viewing