I have bought flannel from Moda that was wonderful and even had great success at JoAnns .
I use flannel for almost all of my bed quilts and children's quilts. I choose flannel that feels right and compliments the front. Next I wash it - while I am not a prewasher of regular quilting fabric - I have found that quality and price of the flannel does not correspond with shrinkage and that the shrinkage of flannel varies greatly bolt by bolt. Actually the piece I purchased that was Moda shrank the most of any piece of flannel I have ever purchased. But it was soft and beautiful even after washing and a perfect backing for the quilt.