When "visiting" the Quilt in a Day store in California last fall, I noticed that Eleanor Burns had a nice selection of flannels. I suspect they are good quality (but I didn't purchase any). Here's a link:
http://quiltinaday.com/shoponline/fa...fabric=flannel
and a bunch more from a related site...these are just the "Sale" flannels...
http://www.eleanorburns.com/shoponli...t=Sort+Fabrics
It's probably still a good idea to wash them before cutting/sewing.