Personally wouldn't do anything. Call me strange, if I go to a store and find I'm undercharged I usually say something. Sort of a Karma thing.
Side to this, bought a camera and couple of memory cards, camera was crap went to return the camera only, store wanted to refund full amount. After explaining the error to two different people that couldn't get that I was keeping the cards, happily pocketed the extra $80 bucks.
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