Sprint iphone 4 monthly bill price?

So i know i could have asked a sprint customer service person, but sprint is closed and i have until 8AM tomorrow to convince mom to get me one.
I want an iphone 4 or a 4s. Now i have some friends in school who said their bills are in between $50 - $75. Thats the same amount as my stupid Metro PCS bill and believe me, the phone is no walk in the park. So how much really for a sprint monthly bill for an iphone

Before taxes and other fees, a Sprint single line account with an iPhone will be $80 per month, with taxes and such, expect it to be between $85 and $105.

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