RadioShack has dropped the price of the Apple Inc. (NASDAQ:AAPL) iPhone 5s to $99 with a two-year contract. This is $100 off the regular price. Even more money can be saved if the customer trades in an older iPhone — meaning an iPhone 4s that works on either AT&T, Sprint, or Verizon including the charger. The older iPhone cannot have any cracks. If the criteria is met, then the customer could get the iPhone 5s for free. The iPhone 5 can also be traded in. This deal is available to customers that buy an iPhone 5s with an AT&T, Sprint, or Verizon service plan. It is unknown how long this promotion will last.