Erroneous Charges
It might sound like a hassle, but checking your receipt after every purchase could save you a lot of money. Mistakes happen, and you want to catch them before it’s too late. Some items may have scanned twice. Maybe your coupons didn’t go through. Maybe you’ll find that the price on the receipt is different from the one you found in store.
Once you get your receipt, walk over to the side and look over it. If there are any mistakes, bring it up with a sales representative.
Or, you could do so in the parking lot. Just don’t wait too long, or else you might forget to do it!