How much does the iphone 4 cost without an upgrade?

Alright so, I currently have an ATT dumbphone, the Samsung evergreen to be exact. Well it sucks so I'm trying to upgrade to an iphone 4 but I don't have an upgrade for a while. How much will it cost to upgrade? I know the iphone 4 isn't the newest model so do I get a discount? Or do I still have to pay the full price?

It is $199 for 8GB.
$299 For 16GB.
$349 for 64GB? Not sure about the 64GB.

Full price. No Discount.

I recommend that you check out Craigslist to buy the Phone. Generally people will sell the 8GB for $100 Used (Sometimes relatively new if you are lucky. Just make sure you don't get scammed.)