I don't know how you can't, just go down to your local game store and buy the game/ console you want.
There's only like 1 game store in my town, and they don't supply any Gamecube, PS2, Xbox, GBA, or any older games/consoles than a Wii/360/PS3
You can always use eBay/ Amazon.
My parents won't let me for some reason. But as soon as I move out, I'll be doing that a lot