Myself or any others on my plan are eligible for an upgrade until 2013. I'd like to get the new iPhone 4s. What's the cheapest route for being able to do so?
If you are comfortable with pre-owned, I bet you could get a decently priced phone through ebay or craigslist. Just make sure you call in with the MEID before the purchase so Sprint can check to see if it is lost or stolen.
First call Sprint to see how much it would cost to buy out your contract. Then you will get the new customer price for the phone.