For Canadians: http://www.ebgames.ca/gs/mailer/kid-...stores-en.html
For Americans: http://www.gamestop.com/gs/landing/events/kidicarus/
Go pick up your booster packs now, if not, at the very least you might get some Streetpass data or play a few fellow fans! I know it doesn't seem to say anything about booster packs, but I read this on another forum and gave my local EB Games a call this morning, they have free booster packs for people that go in and try the game or bring their 3DS's. I'll be passing by an EB Games on my way to work today, so I'm looking forward to getting a few new cards.
Just as a fun tidbit, the booster packs are going up on eBay right now for roughly $10, so if you can band together with a friend, it might even be worth a car ride there.