Though maybe not as big as that other electronics surplus store on Queen Street, this is my place to hit up for random cables and gadgets. I never seem to spend more than 20 bucks at a time here and can find basically anything I am looking for.
It's one of those shops where you might come in for some batteries or some kind of adapter and you will find other little knick-knacks that you can use or have been meaning to get. The prices are dirt cheap but some of the products are flimsy so beware. You are best just sticking to the sort of things you can't lose with, such as stereo cables, extensions, splitters and other fool-proof gadgets.
Staff is always nice and helpful. You would have to be a fool to choose a store like Best Buy over this when it comes to the little things.