The buy & sell is mostly used guns. Great deals to be found though. Often you can end up getting upgraded guns in excellent condition with extra mags, etc for the price of a new one. There are also a few retailers that sell non-clear guns, but those are not as plentiful as they used to be, as it's hard to get stock.
Just a word of warning though to avoid you 'price shock'. Whatever you see a gun going for on a foreign site, convert that to Cdn funds, and our Canadian price will be 2-3x that price.
You can find your local age verifier in this thread.