You can find the stepping stones and casting kits in craft stores like Michael's and Jo-Ann's Fabrics.
Specialty stores, like Jo-Ann Fabrics, are usually a better bet.
Stores like Jo-Ann's and Hancock Fabrics often alert subscribers when decorator fabric is on sale.
Joann.com is the online store of Jo-Ann Fabric and Crafts, a popular craft store that sells a number of supplies for scrapbooking, card making, and rubber stamping.
There is also a large line of exclusive Jo-Ann Scrap Essentials albums and embellishments.