Radio Shack this evening said that its recent and rare iPhone sale was restarting again on Wednesday. The carrier will sell both the 16GB iPhone 4 and the 8GB iPhone 3GS for $50 off when mated either to a new contract or a qualifying renewal. Trade-in values also stack on top of the discount and will give back either $75 for an iPhone 3G or $125 for an iPhone 3GS, resulting in as little as an $24 outlay for those trading up from last year's model.
