Ya'll must have some nice Walmarts. All I can think of after seeing the title of this thread was, "You want to do what?" At my local Walmart I bet it wouldn't make it a week without being messed up pretty good.
Unfortunately, space seems to be the problem but to me, restaurants are good place for them. Around here their is ALWAYS a wait and the places that have arcade games shows them always being used. Parents hand over a couple bucks to their kids just to keep the piece.