Does anybody know of any local computer/electronic stores around Mac that have a wide variety of connector cables? I'm looking for a female red and white connection to a 3.5 stereo cable

There's a Canada Computers store at the plaza on Main & Dundurn. They should have what you're looking for.

Be prepared to shell out like $20 for an in store for a 3.5mm to Phono Stereo cable. Canada computers at main and dundurn (10 min bus from Main&Campus) is probably the cheapest. The source at Uni Plaza should also have it.

Monoprice is probably the best place to buy online if you dont mind shipping.

Cheapest way to obtain that item is in the basement of Jackson square (1-10$). Walk past the LCBO and down the escallator; the store is on the left. Canada computers will sell you a more expensive one, but I'm sure whether there is a whole lot of difference in quality. Phono to RCA typically are built poorly in the first place, no matter what the 'brand', and I usually buy a couple at a time for various purposes.