The best one is on Jl Sulawesi by the river in the centre of town, it's called Pasar Badung and during the day the main building has much on the two floors but after 6pm the night market starts in the car park. This is amazing !! there is so much to see and you wonder how so much produce etc could be sold. It's very colourful and well worth a visit you will see so much. On the other side of the river is the Pasar Kumbasari which sells many craft items plus other goods as well, open from 9am until 9pm.
Also there is a night market on Jl Gadung and Jl Kemuning out side of the centre of town called Pasar Malam Kereneng again many clothes and souvenirs etc to be had, opens from 6pm until midnight. Gembira belanjaan !!!.