How much is a iPhone a month?

Including tax and all others

On Verizon, if you were to open a new 2 year contract with unlimited texting, and limited calling, you would pay about 330$ the first month, and that would include the cost of the new iPhone 5.

It varies drastically based on what carrier you go with and what plan you have. You will have to go around to different carriers and ask for the prices.