Microsoft and other respected console manufacturers haven't been able to get the materials they need to make enough consoles to meet demand. As with the PlayStation 5 and most PC video cards, there's a chip shortage right now that is slowing supply. The pandemic affected production for a lot of chip manufacturers, and industry watchers currently don't expect the issue to be entirely resolved until the end of the year. This site will give you the information you need to go about purchasing a next generation console.