This guy has been around for a coon's age. He buys and resells pretty much everything electronic.
If you want parts, this is the best place to get them cheap. I've shopped around a few places in Toronto. Sayal is a good one too, Vic park N of Steeles. Sayal stuff is all new though, and they have just about any cable you could possibly want.
A1 is mostly new for small components (resistors, switches, soldering stations etc) but they have a buttload of used stuff in the larger sizes, cases, transformers, toroids, speakers, etc.
Surprisingly, the owner is ACTUALLY HELPFUL. Which is a major departure from the way most of these used/surplus electronics places. Active Surplus has a company policy (I think) of condescending to customers, and giving answers that sort of make you feel like an idiot most of the time. Lots of good stuff at Active, but A1 is cheaper.
here's another one that I check out somewhat regularly.
http://www.torontosurplus.com/
One day, I hope to have a boom mounted stereo microscope with fiber optic lighting by a major company. Someday.
Katou