There are no airsoft dealers that sell black guns in Canada.
Whether you can get the black guns or not all comes down to how old you are. If you're 18 or older, then you're in luck. All you have to do it meet with an age verifier and you'll have access to the 18+ sections of the forum. If you're not 18, then you're stuck with what you see until you are. And you can't black import guns from out of the country either, in case you thought that was an option.
I suggest you take a look at the information section of the forum and read the faqs and such. You'll quickly realize that airsoft in Canada isn't as simple as walking to a store or ordering from a web site.