I am addicted to Joann's fat quarters when they are on sale for 99 cents also. However, if it's a fabric I really like, I look for the same thing on the bolt. Often it's on sale for 30% off and if it's originally 2.99 (and sometimes I'm lucky and it is) then I might buy half a yard for the same price as the fat quarter.
I love having all those fat quarters in their handy little storage whatsis thing - I do a lot of quilting with "scraps" and some applique and those fat quarters are just right for that. Also have a fantastic swing bag pattern that takes 2 fat quarters, 2 zippers, and some leftover batting.