Supertangrams are the shapes made by joining four congruent isosceles right triangles edge-to-edge. They can be arranged to make various figures in a range of geometric puzzles, including some with substantial curricular value.
I sell plastic supertangrams.
They come in four colors, so I recommend purchasing a multiple of four sets.
The price is $3 per set, plus $12 for shipping and handling.
If you buy eight or more sets, I'll throw in a free hard copy of SuperTangrams for Beginners, Book 2. Otherwise, I will sell it to you for $5, including shipping and handling.
For ordering information, e-mail me.