This weekend Verizon is offering $100 bill credit (available after 2 months) when you buy an iPhone 4s or iPhone 5c The effectively makes the iPhone 5c free with 2 year plan and gives you $100 to take an iPhone 4s. Obviously you’ll be in a 2 year plan and I’m not sure how useful an iPhone 4s will be in 2 years but hey.
If you agree that the iPhone 5s (Gold) is best, then Best Buy has a pretty solid offer this weekend. Trade in your iPhone 4s or better for at least $150 which also happens to be their sale price of the iPhone 5s 16GB on all 3 carriers. It is convenient but if you are trading in an iPhone 5, you’ll probably get more money at Gazelle ($10 bonus using this link) or Amazon.