I did actually track Xbox One Codes in the past, but stopped as only one or two stores were listing them. I've noticed a few more stores are now stocking them, and they seem pretty popular, so I thought I would bring it back!
You can access Xbox One Stuff here;
I'm having some problems with the Amazon feed so I can't get theirs in there for the time being
CDKeyPrices is generally moving away from price comparisons of region locked stuff (unless its very popular) which is the reason I am not putting up Playstation 4 codes at this time.
As always, any suggestions, please get in contact!