This is something I'm very interested in, and I've actually found it very difficult to buy these shapes. Do you have a link to a supplier? I've even approached ceramic studios about getting them custom made, but without any real interest.
Bonus points if you have a supplier for einsteins!
Oh it's been a while since I looked, one of the tile stores I used to go to in Montreal had them -- not as a set mind you, but as two different lines of tiles that happened to be the right proportions to reproduce the pattern.
Assuming you have a tile cutter for when you hit the walls, why is this diabolical? It sounds enormous fun.
Famously where Penrose got the idea from in the first place.