A few of you have asked me where I buy discounted fabric in Boston. The short answer is: I don't anymore! But, I used to! There are a few stores that are worth a look.
Sewfisticated has two locations. I've only been to the one in Somerville (on the Cambridge line). I really like this store. It is clean, bright, and mostly dust free. There is a great selection of home decor fabric, silks, polyester knits, African fabrics and lots of cotton. I've found some great designer fabrics for $2.99 there. There is also quite a large selection of wool suiting.
Sew Low Discount Fabric is in Cambridge about 3 blocks from Sewfisticated. It is easy to go to both stores on the same outing. This store is definitely cramped and dusty though it is worth a look around. I found this swimsuit fabric for $2/yard and it is the same stuff found at JoAnn Fabric for $12.99 (regular price of course). If you are into making men's underwear there are hundreds of underwear band options, which I found amusing.
Winmil Fabric is in Chinatown in Boston. Like any discount fabric store, you won't find the best customer service and the selection may be hit or miss but the prices are good. Oh, and a cat lives there, which seems extremely odd for a fabric store.
Do you have discount fabric stores near you?