How much does an Iphone 4s really cost?

On the Verizon website it says the 4s is available for $100 (upgradable price). My sister got the 4, which is technically 0 dollars, but she said it costed her about 160 dollars or so. She was the first one in our family to actually get a smartphone, so that means it probably was really high because she had to pay for the new data plan, right? I know there's an activation fee for Verizon of about 30 dollars or something like that? Anyway, I want to know if I buy an Iphone 4s for the upgradable price of 100 dollars, how much will I really be paying (minus the data plan)?

I have a 4 person plan with sprint. Got all 4 iPhones free and with a little bargaining they dropped the activation fees.

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