Good afternoon and welcome to the QB from SE Michigan! There are so many different places on line that sell quality quilt shop quality fabrics. I use several. Fabric.com is a good one, I use it most frequently. I am sure there will be many who will add different sources. Connecting Threads and Marshall's Dry Goods are a couple more. Paducah's is one of the best. The list will go on for quality fabrics that can be purchased online.
You will find a lot of wonderful and helpful people here. Glad you have decided to join us here at theQB.