By the way, welcome to NE Ohio from another NE Ohio girl. Are you going to the Sewing and Quilting Expo at the IX center next weekend? Nice show with lots of venders, you may find a source there. I think most all the local shops will have booths there. If you go, make sure you stop at the bakery kiosk located at the top of the escalator right in the main entrance....YUMMY!

I don't know if any of these stores carry flannel, but it gives you some phone numbers to check out.
http://www.quiltersfling.com/