Ebay is really good for fabric, I was given a gift card to ebay and spent it all on fabric and rotary cutter blades. One other link I will post that is a great deal and they work good in my olfa rotary cutter,
http://myworld.ebay.com/threadart1/
I would stay away from the "pound" lots. I bought two of them, and wasn't disapointed, but others who are looking for largers pieces of fabric would be. Just remember you don't always get what you pay for :roll: