Commission sounds great; but, keep in mind that if the shop goes out of business or is shut down for any reason, your merchandise may not be returned to you. Make sure you have some kind of paperwork detailing what you are turning over to the shop--signed by you and the shop owner and dated. For other crafts the going rate is calculated at two and one-half times the cost of materials, overhead, time spent making the item. You need to decide what your time and work is worth. The retail pricing of the quilt is the problem of the shop owner. Don't under-estimate the value of your work.