Here are some places you can find it as of late July 2022:
Even Verizon is now starting to sell Xbox Series X consoles (as part of the Xbox All Access subscription that includes Game Pass—not for the standard up-front $499.99 price.)
It would be nice if this console were even more consistently available, but it’s 2022, and supply chains are weird for all sorts of items. Even if you strike out and all of these stores are out of stock when you look for one, there’s a good chance they will come back in stock soon. It’s not like it was anymore—consoles don’t just appear in stock and sell out almost immediately. You don’t have to pay attention to social media to score a console “drop” or pay a high markup on eBay.
Now if only Sony’s PlayStation 5 would be more consistently in stock. Hopefully, that will happen soon, too