At Gamestop, there is now a new exchange action until May 5th of May 2022. You can currently secure you with the delivery of an Xbox One X 1 TB incl. Controller and cable the Xbox Series S for only 49.99 euros.
If you have the Xbox One S 500 GB with controller and cable, you get the Xbox Series S for only 99.99 euros.
If you still have a PlayStation 4 Pro 1 TB + accessories, you even pay only 19.99 euros during the exchange.

Further offers and the fine print can be found on the side of Gamestop:
* Gamestop Exchange action for Xbox Series S
How do you like the offer and will you use it?