My original set of molds, all three sizes, were from Blues Creek and they built quite a few instruments. Lately, I've been using molds that I made for a more contemporary shape but the classic Martin shape isn't going to go out of style. Ever.
Make your own, I used a band saw and half inch siding scraps, I got for free from a garage project, for a full body baritone mold. works great for bending and assembly.