Why are posted prices different than the cost at checkout? I have had three incidents recently where the posted price for a six pack of Pepsi diet had a shelf-listed price of $2.50 but when I checked the register tape I was charged $3.00.

If you dispute it, they should fix it for you.

It's a register mistake, they will fix it.

Price changes probably wasnt done...just take your reciept and speak to management they will give you back the difference

Usually what happens is the computers weren't updated for the sale price. Take your receipt to customer service and they will refund the difference. A lot times no one tells them so it's very important to let management know the issue. Just make sure you can prove the lower price was displayed in aisle.