The holiday shopping rush has already peaked this year, and so now retailers are tasked with attracting the interest of last-minute shoppers. Best Buy (BBY) has a number of deals available right now, but one in particular stands out: The retailer is chopping $50 off the price of all on-contact Apple (AAPL) iPhone 5 and iPhone 4S models. With this limited-time sale, buyers can get the iPhone 5 (16GB) for as little as $149.99 with a new two-year service agreement, and the iPhone 4S (16GB) starts at just $49.99. Best Buy has not indicated when the sale on Apple smartphones will end.