How much will an iphone 4 cost if my contract is up?

My 2 year plan is up(verizon) in a few months and i'm elligable for an upgrade. I want an iphone 4 cuz i heard the price has gone way down since the 5 came out. Some one told me that if you have an upgrade, its free.i've also heard that its 100 dollars… Anyone know!

The iPhone 4 8gb is free with a new/renewed contract
the iPhone 4s 16gb is $99 with a new/renewed contract