We have a section here on the forums that deal with retailer reviews, most of which are Canadian, but only opens up after your account as been age verified. I think this is an excellent place to start looking. You'll both find something in your area, as well as getting a feel for their reputation.
The classifieds are also another good place to look for a gun. Second hand guns are not usually a bad thing (as most are still in stellar shape), and are often marked at huge discounts compared to their original retail prices. A very good bargain for someone on a tighter budget.
And, of course, take some time to read a few posts here. This place is pack full of airsoft knowledge. Don't be afraid to ask us any questions!