Quilt pricing is a hard subject to tackle. I used to be a coordinator for a woman's group (30.000 members, we have handicrafts shows, our rule-of-thumb was 3 times the cost of material for insurance purposes. We suggested to follow that rule when selling their handicraft. (The customer does not need to know if you got the material for free or if it is a pastime or you need the money).
I would like to add one more information, if you own a heirloom quilt or one you cannot part it. Have it appraised by a Certified Quilt Appraiser. The information to find one can be obtained through your local guild or the American Guild Society.