Bbet, my group does this. We solely exist to make donation quilts for primarily 3 local charities. There are about 12 of us who are active, yet in the 11 years we have existed we have given away 2739 quilts, to date. The members pay for their own materials or use their stashes, but we do have fabric donated every so often. The church buys us two rolls of batting per year, and after that's gone we pay for it ourselves.
Maybe your church could budget to support you with some batting, yearly. You will have to get the group established first, and produce some quilts out of your own pockets. It's worthwhile.
I also encourage you to find local charities to support, so there is no mailing involved. I believe in supporting our local communities.