I read somewhere a while a go that you should charge three times the cost to make the quilt. If I am doing something for a family member or a really close friend, I usually just charge them what it costs me to make the quilt. They always give me extra $$ for my time (although not nearly enough), but I do it as a favor to them. If it is a random aquantance or a friend of a friend, I quote them the higher price, as it lets them know that they need to be serious about it before I get started. I also ask them for 1/2 up front because I don't want them to back out on me after I have spent the money to buy the fabric.