At Amazon, trade in a game, console, or accessory to receive a $50 credit towards the purchase of a PlayStation 4 Slim Call of Duty bundle, as listed below. Once you select your item to trade in (which meets Amazon's criteria) you'll be sent a free shipping label. The PS4 Slim features the same internal specs as the original PS4, but it has a slimmer exterior. It includes a DualShock 4 wireless controller, Call of Duty: Modern Warfare for PS4 download code, and HDMI and USB cables. The $50 credit expires June 30. Deal ends April 30. The deals, each with free shipping, and comparisons assuming you'll use the credit: Of note, the $50 credit applies on top of the quoted Amazon credit you'd normally receive for the trade-in.