Know of any plastic interlocking shape toys?

Question

I'm wanting to know the brand names of plastic interlocking shape toys. They come in a box of various shapes, primarily squares and triangles. Each piece is about two inches a side.

I have seen trays of both solid and hollow (frame) shapes in places like primary schools and doctors' waiting rooms, but I'm not sure where I can buy them. The name of a place that makes them would be a good lead.

Answer 1

School supply stores like the Parent-Teacher store have them.