It's a bit hard to find but it's here:
http://airsoftcanada.com/showthread.php?t=74996
From the main page you need to scroll down to the Players and Events section and go to the last subforum called Regional Representatives. For Ontario you'll need to scroll down to like half way down the page.
From google maps it looks like London and Woodstock are the closes larger towns. I'm 99% sure there's a dedicated airsoft store in London or at least a place that does paintball and airsoft. But should have no problem if he's looking for an AV and can drive or at least wait for an AV rep to pass through the town or whatever.