LOTS of good advice here that I cannot add to other than to suggest you look at Etsy pricing.
People have no clue what goes into a quilt but you should at the very minimum get the cost of materials and electricity.
Then start buying material with a discount and try to price them higher.
At some point, I'd rather donate than sell for less than the worth. Makes me angry so I'd rather give to someone who would appreciate it and cannot afford anything like it at all.
IMHO