Hydrocal/Ultracal (plaster) alternative in Europe I'm looking for a detailed hard casting plaster, like Ultracal or Hydrocal. However I can't find a distributor of these two in Europe (England, Germany...)
Besides some overlypriced bags, sold by individuals on Amazon (however they usually have only one or two bags).

Is there an alternative to these Materials that Europeans use? Because I can hardly imagine that they don't make plaster/stone castings.

I've heard, that you could use something like dental plaster.
The material you are looking for is sold in europe (or at least in germany) by the chemical name: calciumhydroxid (ca(OH)2. You can purchase it as a paste oder in powder form practically everywhere; your next door pharmacy, home depot store, aquaristic store or online.