Hey there,
I posted this tip on another thread but for those who didn't see it. www.freecycle.org is a GREAT resource for getting fabic absolutely FREE.
I simply put out a post that said WANTED - Quilting supplies and Fabric. And I came home with a bunch of Quilt-A-Day books, and several trash bags full of fabric and scraps.
So you may check for a freecycle in your area and see what you can find. Not bad for driving to aq few houses in less than an hours time huh?