Think of it as a win/win situation. The store that is closing is trying to make as much money and re-coop their loses as much as possible; you on the other hand, are getting a bargain on things that you may not have been able to afford otherwise. If you bought more than you wanted, then the things you don't need would make great gifts for your other quilter friends (and you still saved money).
Bottom line is, I still tend to go overboard because I know I will never see that bargain again. Oh, well...