If you want a brand new Xbox One S when it releases on August 2nd, GameStop is offering a trade-up program involving your old systems.

Below you can find the full list, with the PS4 granting the most trade credit, and the only one actually locked at $200, while your Xbox One will net you "up to" $150 in trade credit. Wii Us and 3DS XL systems lag behind, with up to $100.

The offer is valid for almost all Xbox One S systems announced so far, including the Madden NFL bundle, the 500 GB Halo bundle and the Gears of War 4 bundle. The 1 TB Halo bundle doesn't appear to be included, but that's probably because it's not available for pre-order at GameStop.

Another caveat is that it appears that the offer is valid only tomorrow, July 30th, so if you want to take advantage of it, you have to hurry.

[Thanks for the tip: Millennia]