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Editor's Notes & Price Research
You may also convert this to Game Pass Ultimate; get 3-Months of Xbox Game Pass Ultimate for $1 valid for New Customers. Refer to the forum thread for additional details and discussion on how to maximize your subscription.
This can be used to convert to Gamepass ultimate (paying $1), although you might want to get as many as possible before, so each month is converted 1 to 1. 36 months would come out to 109.08.
Note: in the previous post there were people saying that it threw an error after adding more than one code, but many were able to stack just fine. Refreshing the page and trying again seems to have worked for a few. Enjoy!