What is your favorite fabric store
 

I am in Ontario.
My favorite is Len's Mills, followed by Fabric Land. There is also a great thrift store right beside Len's Mills that sells fabric as well, so go to one then the other in one trip....awesome!

Tater Patch Quilts in Merrill, Oregon.

Backdoor Quilts and Bernina Sewing Center-Billings, MT

Usually whichever one I am in. Though there are a very few exceptions.

Calico Patch in Northeast, PA.

Cozy Quilt shop in san diego, ca

AliKat - you took the words right out of my mouth - whichever one I was just in!

so many shops so little time. Love them all.

Burkholder's in Denver, PA

Online it's Hancock's of Paducah, hands down. http://www.hancocks-paducah.com/

In person (central NH) it's Quilted Threads http://www.quiltedthreads.com/ and
Keepsake Quilting http://www.keepsakequilting.com/
although both also have online shopping for all you folks from 'away'. :)