Have a bargain bin. I was in a quilt shop the other day. I asked for a yard of fabric. When she came to the end of the bolt, there was about 1/8 yard over what I wanted. She asked me if I wanted it. I asked if there was a discount, and she said "no." So I asked myself silently, "I said I wanted a yard. Why would I want more just so you don't have a scrap left over? What would be in it for me? I spend more money and get more fabric than I wanted." So I said, "No." She looked disappointed.
Later I was thinking about this and realized that now her only recourse is to put that out at a reduced price. Why not offer the reduced price to me? I also realized in this same stream of thinking that most of the fabric I own is small pieces found in a bargain bin. So I say, have a bargain bin, and offer the end of the bolt at a reduced price to the customer who purchases the bit that came just before it.