If you're going to just do driving schools proper, then a motorcycle or M helmet is sufficient. In which case you could visit just about any motorcycle shop.

If you're planning to go racing (real racing), you should buy a "Special Applications" or SA helmet.

M helmets are cheaper than SA helmets.

See our links page for references to vendors in Ontario and Quebec that sell helmets. Also, if you're near Hamilton, Ontario, visit Grisdales Racing (905-627-0224 or 1-800-561-1791). In Montreal, you might try Trac Racing (450-629-2829).

A recommendation: take your time buying a helmet. Make sure the sales associate is knowledgeable and spends time ensure the proper fitment.