The Quilt Barn is great. It's in Colden, although I think they list their address as Boston.
Pine Grove Quilt Shop (2962 Delaware Avenue Buffalo) is very nice.
Auntie's Attic Quilt Shop (2043 Military Rd Niagara Falls)
Patchwork Garden is at 6281 Transit Road
Threads of Time on Sheridan Drive
There are two nice ones in East Aurora - Aurora Sewing Center and The Carriage Quilt Shop
I have lots of family there so I visit and my aunt and I create our own shop hop for a few days. Been to all these shops, and would go back. Have fun!