Coupon dead, post updated
7s+ 128gb ALL BACK IN STOCK, costs +$50 over the 32GB!
From the 6s+ deal, there is a chance you will get a Sprint eligible phone. Some here are saying 40% (more ineligible than eligible).
You can unlock the phone for AT&T T-Mobile and their MVNOs (Cricket, Metro, etc.) using RSIM 13 or RSIM SUP. This costs about $5 on eBay.
These are used but generally in very good condition, may have some scuffs on the body, screen is usually pretty clean. Battery usually between 80%-95% health.