Because I do mostly scrappy quilts and raw edge applique I buy in fairly small quantities. 1/4, 1/2 yards at a time. If it is a fabric that seems as though it would be really good for a border, such as a stripe, I buy about 2 1/2 yards. Of course, it also depends on the price. If a REALLY good sale (75% off) I buy more than I would normally.