One of the things that bugs me about living in a rural area is the inability to find items. One is this Ultracal 30 plaster that I'm attempting to use to make these Corkus arms. I have checked 2 drywal supply houses, different paint shops, and checked the Lowe's and Depot websites. I'm getting nowhere. I'm wondering if anyone knows of a national chain that would have this stuff, or if not, would using Plaster of Paris be that big a deal? Thanks for any help you can give.