One quilt I used to go to (sadly gone now) had a policy that if you bought a pattern from them, lost it and bought a second one, and then found the other, if you brought both of them in they would let you exchange one of them for another pattern. We all loved it because it had happened to us one time or another. The owner said they had never had anyone abuse it and had enjoyed being able to give that "perk" to their customers. And I always looked for a pattern that I wanted there first just because I had that "insurance policy".