Why is at&t has a different price?

I wanna know why when i go to apple the price of the iphone 5s is 200 dollars… And if you go to at&t, the price is 300 dollars! Why? Is it 100 dollars more? And also when they ask you on apple… What life of telephone i want… There's at&t and i press on it and is still 200 dollars but if i got to the page of a&t is 300! WHY? I really want the iphone 5s and don't recommend me other phones just tell me the reasons why… IF YOU GIVE ME ALOT OF INFO I SWEAR I WILL GIVE YOU 5 STARS!

They're the same price on either site, check again.
16 GB is $199, 32 GB is $299.

The price is not different, it is same on every store and site. Please check again.

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