Say they buy Super Mario 64 (I know its an old game but whatever) They get it from the company that manufactured it, in this case Nintendo.
it's a Video Game store in Australia
you can get them at any video game store
any store with video games
The Professor Layton games are at your local video game store.
there is but where is the video game store
VGP video game plus
no game boy is to old for you to sell at gamestop.
You will have to look at the coupon. You should in fact be able to use a coupon from a video game store to purchase new games as well as used games.
Supercell is not a video game but is instead a mobile video game company. Supercell's mobile video games can be purchased and downloaded from the Apple App store.
Go to a local video game or electronics store.
It differs from store to store, depending on what the owners of the store wants for it and how much the publishers that sell the games to the retailers sells it for. Skylanders will however (unless you find it on sale or if its used/ second hand) cost about 50€/£/$
Store have to place orders for the games people want. They get them from the company the game is made by.