Bluprint is a crafting website focused on instructions and guides for crafts and art. They also sell supplies and kits.
Annie's Catalog, or Annie's Craft Store, sells fabrics and crafting items. They also offer courses on topics like crochet, quilting, and more.
Fabric.com sells a large variety of fabrics and materials for sewing, apparel, and crafting purposes. They are a subsidiary of Amazon.
JOANN is a retailer of fabric and craft supplies with over 790 stores. They sell a massive variety of supplies, with over 100,000 items.