Where to buy a variac?

The iron wire demonstration is brilliant for showing an application of a solid state phase change, an allatropic phase change, and an real-world application of the idea that different crystal structures do, indeed, affect the properties of a material.

The biggest to that hurdle, however, is finding a way to adjust the AC current traveling through the iron wire, itself. It is possible to do so using very unsafe methods (I've seen it done with a split cord, two copper wires, and a trough of water to which an increasing amount of salt was added, but I do NOT recommend that method), but the best method is a 20-amp variac.

A couple of master teachers swear by the variacs that come from Parts Express, but they're $200, or alltronics, still $170. Recently, however, I found what looks to be the exact, identical variac available for $109 from Circuit Specialists.

Has anybody ever ordered from Circuit Specialists? If so, what was your experience - especially as to the quality of their product?