From 9to5Toys.com:

Boost-mobile-iphone-sale

As we’ve noted on a few occasions, Sprint pre-paid subsidiaryBoost Mobile is now carrying the iPhone for the first time in its history. Launching today, the iPhone 5s and 5c are $100 off of Apple’s retail price if ordered online. However, Boost is running a special promotion until November 24th where you get an additional $100 off if you switch in store from another carrier. I confirmed the deal with a PR rep who said:

Yes. Now through Nov. 24 new customers who come into a participating Boost Mobile store and switch to Boost Mobile from another carrier will be eligible for a special in-store promotion of $100 off any device bringing new customers  additional cost savings.  The link below will help consumers find participating stores in their area that are selling iPhone.

Boost Mobile plans start at $55/month but drop significantly as you make payments on time. Find the nearest Boost Mobile here.