Sculptors and mold-makers: does anyone know where I can purchase Ultracal 30 somewhere within 1-2 hours of the Philadelphia area? As you likely know, Ultracal is the best gypsum product to use in mold making and it is also extremely hard to find. It is readily available online but the cost of shipping does not make it feasible. It is my understanding that Ultracal can be found in un-seeming places like ceramics shops and lumber yards. If anyone has a lead of where I can buy Ultracal 30 gypsum cement in my area, I would greatly appreciate it.