Thanks for the help guys. I'm definitely on the Jo Ann's mailing list. I buy the duck cloth, for my TK belts I sell, in bolts. It's always fun to walk up to the cutting counter and say, "All of it" when they ask, "how much?"
I think Rochford was the supply source I was looking for. But I agree, Dritz at Jo Anns work great. I'll keep an eye out for sales. This quest was for a friend of mine, who came across the snaps on sale at Jo Anns in the end!