Wholesale, in the sense of a used car! Private sale is a Private sale, you deal with the person for the total price, and a broker will do the rest.
RIV doesn't give specific's like that! My suggestion to you is to call the headquarters of the make you want directly and ask them for what mods need to be done for it to be admissable in Canada. Every car is different. Worst serive is probably from Benz!
But like the OP said, some crazy nice cars for cheap in the states nowadays!