Here are the list of shops I enjoy visiting! :))
Daiso
I tried my luck one fine day and found out that the store has a crafting section too! Fancy a $2 acryllic bag handles or cute fat quarters?
Spotlight @ Plaza Singapura Shopping Mall, Level 5
Singapore largest air-conditioned fabric shopping place. Need I say more about Spotlight? Keep a look out for sales!
Golden Dragon @ 101, People’s Park Centre, Upper Cross Street #02-51 S(058357)
This store is a crafting heaven! They sell everything you need for sewing, knitting, crocheting and crafting.
Chinatown People's Park Complex
You can find more variety of fabrics here at relatively lower cost. Many of which imported from China. There are a few shops selling Japanese imported fabrics from $12/m onwards. Try bargaining!
Shops along Arab Street
This is the place to go if you fancy beads, laces and printed fabrics. Some shops allow bargaining too!
Fabric.com
The shop I made my first online fabrics purchase. Costs similiar to Spotlight after shipping charges. Say yes to huge clearance sales!
Fabric TALES
Do you fancy Japanese cloth? I adore it! :) This is the english site of a Japanese online shop named Nunogatari. Fabrics are reasonably priced.
Etsy
Love this place. Just do a 'Supplies' search and you'll find just what you need! :)
Forums
Sometimes home/overseas business owners organise fabric sprees in forums. The down side is that you will have to check spree listing often and the order, depending on when you ordered, usually takes 4-8weeks to arrive.