Microsoft has unveiled two new Seagate expansion cards for the Xbox Series S|X. The 512GB variant will cost US$140, and it is available for pre-order in the United States. On the other hand, the 2TB version costs US$399 and will be available for pre-order sometime in November 2021.
https://www.notebookcheck.net/Xbox-Series-S-and-Series-X-storage-expansion-card-now-available-in-512GB-and-2TB-flavours.574460.0.html