and bear in mind all the prep work, too. Washing, dismantling, ironing. Perhaps you can work out a Time frame with her. One quilt every six months, or something like that. Then the cost won't sound so high. And you will be less likely to suffer feed-sack burn out. I'm with you though, I would be nervous as anything to say a price. Maybe if you have it all written out, like a professional quote, it will go easier for you. Best of Luck. And, feed sacks sound Fun! Lots of work, but Fun. :-)
and, p.s., I really like TXetc...'s reply!