I buy my LEDs from
http://www.lsdiodes.com/ . They ship up to Canada for a pretty darn good rate, and have freebies if you buy over a certain amount. I had 3 LEDs run off of an old 75watt 386 psu for a little while, but I took it down. I will have it up and running again as soon as I get my MH hood put together.
-Richer