Thanks for all the suggestions, everyone! I will definitely visit Quilts and Kreations in South Amherst and the Little Red House is Medina and check out some of the other places you all mentioned. I think the shop in Lancaster that NJQuilter mentioned carries Moda flannels, which I haven't tried but have heard good things about. I haven't tried connecting threads either, but I think I can order swatches from them!