Good question since they have been putting so many things on sale. I look at things NOT on sale but if I don't find anything I 'need' I don't use the coupon that particular period. Not worth it to me to buy stuff I don't need since there is plenty of things I want and/or need.
On buying any fabric that is not on sale: if they don't have enough let's say on a specific color of Kona you can order the number of yards you need and it counts at the sale rate. Kona is rarely on sale so for that one fabric or any other you find, it is handy to know.
:-D