GameStop currently has a bonus $50 trade in on XBox One and a $175 Trade in Credit for PS4 systems. Multiple XBox One systems are also on sale making it possible to upgrade for $100.
GameStop Trade-In Info: http://www.gamestop.com/trade
For example a XBox One 3 Battlefield 1 500Gb Console is on sale for $250 - $150 Trade Credit = $100:
So new console, 1 year warranty, and game for $100 + your old console. Check their site for more deals.