You can only trade in 2 disney universe's for each system at the same time at best buy right? Or you get banned? Is that the rule?

And are you guys literally just buying the games at the general checkout line and then walking over to the game section to get the game clerk to accept the trade ins? I'm wondering If I should hang out in my car for a few minutes or something before going back in the store to trade my games in. How are you guys pulling it off?