No. Just checked bestbuy.com and a 16 GB 5s is $199.99 with 2 year agreement which is the same price as a 16 GB iPhone 6.
In Britain if you buy outright then the 16gb iPhone 5s is £80 cheaper than the 16gb iPhone 6. If you're buying on contract though you're at the mercy of whatever the provider chooses to charge. Whatever it is it'll always be more expensive than buying outright and getting a sim only contract.
Just checked Verizon.com and the 16 GB 5s is $99.99 with a 2 year contract. Now just need $200. One for me, one for wife.