The iPhone is on sale at multiple retailers. Sprint cut $50 off the price of the 4S while the Verizon and AT&T models are $20 through Target. The aging iPhone 4 is only $50 from Best Buy. Best of all, Apple Stores are reportedly matching these prices. But it’s a bad time to buy an iPhone. The new one is coming next month. You can wait. Plus, that means the older ones will get an even bigger price cut than what retailers are offering right now.