Judging by the Best Buy store database, Western Digital memory cards for Xbox Series X|S will soon go on sale, and they will be significantly cheaper than Seagate drives.
A 1-terabyte drive from Western Digital will cost 180 US dollars, whereas currently buyers can purchase a Seagate memory card for no less than 220 dollars.
At the moment, it is unknown which models WD will offer, but it is assumed that the manufacturer will sell cards with capacities of 512 GB, 1 TB, and 2 TB, just like Seagate.