Metro, there's a great place in the GTA I found a while ago and it came in handy when I was making a wire to hook my old truck up to my laptop to record engine data from the ALDL. They have almost everything you'd need (save for maybe a chip or two) and everything's dirt cheap.
Sayal Electronics,
SAYAL Electronics - Your Source For New And Surplus Electronic Components - We Buy Your Surplus! I think, they have a few locations in the GTA, Oakville, and Kitchener. and the place is always HUGE. I always end up spending a good half hour to an hour there browsing the random crap they have there.