(reposting as previous post was added to discussion which it isn't; that is a legit deal)
For anyone wanting the dirt cheap Xbox Game Pass Ultimate, follow the method explained on this page.
It worked great for me, see screenshots below..
I paid £120 for 3 years of Game Pass Ultimate, buying 3 x £39.99 12 months EU Gold Passes from CDkeys
I then applied to the Xbox Game Pass Ultimate £1 trial
which effectively upgraded the Gold to Ultimate.
All was done via my browser. The most difficult was actually to pay the £1 as did not work with Chrome so used Edge instead.
Hope that helped someone :-)