Electronics retailer RadioShack has launched a temporary sale on AT&T models of the iPhone 5. From today until December 15th, the company offering a $20 discount; that puts the price of a 16GB phone as low as $180. The same $20 can be taken off the costs of 32 and 64GB phones.
Although iPhone sales are still relatively rare, they have been occurring more regularly during the past few years. The RadioShack offer is presumably meant to draw in more holiday shoppers. Third-party retailers are typically less popular as a place to buy iPhones in the US; most shoppers go to an Apple Store or a carrier outlet, if they don't order online.