How to get an iPhone 5 cheaper than retail price with tmobile as my company?

My company is tmobile and I'm ready for a phone upgrade and I want to upgrade to an iPhone 5 (will settle for an iPhone 4S) but it's super expensive from tmobile (145$ down and then 21$ a month for 2 years to pay the rest of the phone off.) I went to carries like target and best buy to try and get it cheaper but they "do not go by tmobile contract" which would mean I have to buy the phone full price from them, 700$ I think. Is there any way for me to possibly get a new (not used/refurbished) iPhone 5 (or 4S) a cheaper way?

There are three options:

1. But it discounted with a 2 year contract.
2. Buy it at full price.
3. Buy a used phone.

IPhone cheap Fact or Fiction? And its impact on Android phones?
http://telephoneandroid.blogspot.com/2013/08/iphone-cheap-fact-or-fictionand-its.html

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