According to AppAdvice, Target is offering trade-ins on various older iPhones for those who wish to upgrade to iPhone 4, starting tomorrow.

iPhone 3G or 3GS trade-in – In order to take advantage of this in-store only offer, guests must trade in a working iPhone 3G or 3GS and sign a two-year contract with AT&T. Guests may receive up to $100 credit for an iPhone 3G 16GB and up to $200 credit for an iPhone 3GS 32GB, offering great cost savings on a new iPhone 4 16GB priced at $199 or an iPhone 4 32GB priced at $299.

The promotion only lasts a week.  If you look over at eBay however, you’ll see some legwork will be more handsomely rewarded there.

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