At least one Walmart store has slashed prices on its AT&T iPhone 4 and iPhone 4S prices without prior associate notice. The 8GB iPhone 4 now sells for $34 with a two-year contract, down from Walmart's already-discounted $88 price. The 16GB iPhone 4S, in either white or black, is now offered with the same contract for $114, down from the $188 original store price. The Verizon iPhone models are not affected by the price cut, reports Cult of Mac, and its not yet clear if the sale is fully nationwide.