Cheapest Iphone 4 Plan or company?

I want an Iphone 4 really bad, but for Verizon it's 90$ a month! What's the cheapest phone company? And if you have an Iphone (any generation) is your bill high too?

You cam get an iPhone 4 from Virgin Mobile for $35/mo. ($350+tax for the phone).

It's the cheapest way though because there's no contract.

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