At Verizon Wireless, trade in your iPhone 4 or 4s (in good working condition) and you'll get a $200 Verizon Wireless Gift Card. The newly-released iPhone 6 starts at $199 with a new 2-year contract. Redeem the gift card and you can bag the latest iPhone for free. Needless to say with the phone having just been released a few hours ago that it's the best deal we've seen on this model. (It's also one of the strongest trade-in offers we've seen for the iPhone 4 and 4S.) The gift card takes up to two weeks to arrive from receipt of trade-in.

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Note that the iPhone 5, 5c, and 5s are also eligible for the above trade-in credit; however, it's likely that you'll get a better rate elsewhere for these newer phones.