Xbox Series X is back in stock on the Microsoft website. $749 with free delivery. No accessory purchase required unlike the last deal
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.
Don't forget cashback and to activate the Microsoft $20 cashback with $200 spend challenge as suggested by this comment - Credit to user currentfad
If you have done all the above steps your cashback should read the following:
1.5% cashback = $11.24
+ Microsoft challenge = $20
+ 10% back from gift card purchases = $75
Total in cashback = $106.24
Some are ready to fire having the same problem last round hehe :)