Xbox Series X is back in stock on the Microsoft website. However they are forcing an accessory purchase to go with the purchase. I have found a work around so that the console is obtainable for $749 delivered without any accessory purchase through this link
Save a further 10% with Xbox gift cards from the ShopBack gift card store
Login to your Microsoft account and redeem them here:
https://account.microsoft.com/billing/redeem
At checkout it'll use the credit on your account by default.
I can get $150 off this purchase because I have the microsoft store offer saved to my amex card but I still don't think that makes buying this worth it