So for the secret Santa party at work, we need to get our person some sort of creative present. (Never mind that I've only been working there two months and hardly know the guy. ) Anyway he's a fan of M.C. Escher so I figured it wouldn't be too hard to find something. But I'm trying to find one item in particular and I'm having a ton of trouble.

Do any of you know where I might be able to find a Penrose triangle model? See this page:
http://en.wikipedia.org/wiki/Penrose_triangle
The bottom picture in particular. It's an actual 3D sculpture that looks like the Penrose triangle when viewed from just the right angle.

Every time I go to a museum with optical illusions, they have one of those 3D models hanging somewhere. So I figured it'd be a simple matter to find some sort of scientific or geek store selling one of those. No luck.

Any ideas?