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Note, offer valid only for PowerUp Rewards Pro Members (paid service; $14.99/year membership). Some stores do require a valid ID/Drivers License during trade-in process. Trade-in credit will be loaded onto a trade credit card and acts similar to that of a regular gift card.
Editor's Notes & Price Research
Item must be in full working condition to receive full trade in credit. Defective items may be eligible for a trade at a lesser value. Offer valid through September 17, 2017 or while promotion last. - Discombobulated
Valid for PowerUp Rewards Pro members only. Not valid toward cash trades. Trades must be in full working condition to receive full value. Defective items may be eligible for trade at a lesser value. Trades subject to manager approval. Cannot be combined with any other offer. See store associate for details. No dealers. Offer valid in the United States and Guam only. Void where prohibited. GameStop, Inc. reserves the right to cancel, terminate, modify or suspend the offer for any reason without notice. Valid 8/28 - 9/17.
Playstation 4 500GB $175 + $50 extra credit = $225 credit
For those looking to upgrade to the Pro or buy something more expensive than the credit, this can be combined with this deal where eBay currently has a $100 GameStop gift card for $90. Up to 5 can be purchased.