Here are a few stores that I like to visit either to just hang out or buy.
The Last Level
This store is my favorite. They are awesome people, with cheap prices, and they hold the Friday Night Magic event (booster drafting). They also sell time on xbox games for a reasonable price. Their address is 100 Queen St. South in Kitchener, Ontario and their number is 519-571-3293.
They have booster drafts during the week starting at 6:30.
Nexus Games And Hobbies
This is another good store where you can find many magic products. They do not currently sell magic singles.
Looking for Heros
You'll find alot of selection here as for magic singles along with all the booster packs and products.
Gemini Jetpack
They also have booster drafts throughout the week including standard tournaments every Tuesday and Friday at 5:00 sharp. Check out they're website for more details at http://geminijetpack.com/index.html.