What is the cheapest way to get an iPhone with Sprint?

I Really want an iPhone for my birthday. So I have some questions about how to do that, and remember I'm on the Sprint network: P (yes I know they suck, but I can't change)
1. What Sprint plan do I need?
2. Should I buy the phone from Sprint or from Apple?
3. I'm not eligible for an upgrade right now, but my dad's phone is.couldn't I buy it for his phone number then swap the device once I get it?
4.It says Apple's price is $200 for the 16gb. Is it still $200 if I were to get if for my phone number, which is not eligible for an upgrade from Sprint? Or would I end up paying like $600?

Any answers are great! Or any additional information would help too!

Most carriers are offering 3GS free now with a 2 year plan, thats your cheapest method I think. The $200 offer is probably with a 2 year contract, how far are you from being at the end of your current contract? I would just wait it its only a few months down the road and then you can also get iphone 5.

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