Always watch the cash register as your purchases are rung up for scanner errors. Then, if an error occurs, know what the stores policy is, many stores will give you the item free or a credit of several dollars off your total. I routinely get credits and/or free merchandise at Albertson's, RiteAid, WalMart and KMart. You have to ask for the compensation, even insist on it and ask for a manager if necessary to get it.
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