It was recently announced that Seagate has now slashed the prices of their Xbox Series X/S storage expansion cards in the US.
The official Xbox Twitter account has recently posted this new change for the Seagate Xbox Series X/S storage expansion card prices but the change is only available in the US. In the UK though, it seems prices have not changed yet.
Prices when the Xbox Series X/S consoles launched in 2020 were 1TB Seagate expansion card for $219.99. Later in late 2021, the 512GB card was $139.99 and the 2TB card was $399.99.