Read the FAQ first: http://www.airsoftcanada.com/showthread.php?t=23034
Then get Age verified. Once you do, you'll get access to a whole bunch of airsoft stuff on the classifieds. As for the price disparity, getting Airsoft in country is still somewhat considered a grey market thing. It takes some effort and a lot of risk in order to bring it into Canada w/o it getting seized, thus, this is reflected in the price markup.