Oh, wow. I feel like I live in the promised land when it comes to quilt shops. My town has a population of 2,000, three quilt shops and four longarmers...none big enough to have online stores. Just a bit down the road, however, are some major players with fantastic goods. A day of fabric shopping in this area can last the whole weekend!!
For novelty fabrics and 1930's repros I go to Sunshine Carousel Quilt Shop
http://www.scqs.com/
For antique reproductions I go to Pickering Farm
http://www.pickeringfarmquiltshop.com/
For upscale fabrics like Amy Butler and Kaffe Fassett, I go to Peggy Anne's
http://www.peggyannes.com/default.asp
For batiks, Daiwabo Taupes and Japanese fabrics I go to Quilted Threads
http://www.quiltedthreads.com/index.html They have no online store, but they are my very favorite place to go for help, support, feedback, and reassurance. They are awesome people with awesome fabrics.
And, of course, for absolutely everything and if I just want to be open to sensory overload, I go to Keepsake Quilting
http://www.keepsakequilting.com/
Yup, New Hampshire is a quilter's dream!! And it's all tax free!