Great selection, good staff, but expect phone tag
This is my go-to sculpting supply store, in person and by mail-order. Their online catalogue has a great selection and there are links to product notes for anything that I'm unfamiliar with. The downside is that their online ordering system does not process payments (you have to phone them to complete the order) and does not indicate when anything will be back-ordered. This last bit is a problem, because they also don't email you about the state of your order: you have to notice that it's delayed on your own and hassle them by phone. Visiting in-person avoids half of that problem: things might still be back-ordered but at least you'll know about it right away. That said, everything I routinely order has always been on-hand, and I've been shopping here for a decade. I plan to continue doing so.