How much will it cost to upgrade from an iPhone 4 to a 5s?

I know the 5s comes out in 2 days and I really am wanting to pick that up, but how much extra money will it cost if I trade in the 4? I have verizon so if anyone has an educated guess that would be appreciated!

IPhone 5S with a 2 year contract:
16 GB - $199
32 GB - $299
64 GB - $399

iPhone 5S with no contract:
16GB - $649
32GB - $749
64GB - $849
Colors: silver

You can trade it in at the apple store, they will review it and tell you the value. That makes it way easier.

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