The monocog was offered with 26" wheels up until this year (last year?) I think. You could try calling some Redline dealers to see if they have a leftover. I'd encourage him to consider the 29er too, but from what I hear 29er stuff is hard to get in parts of Eurpoe. Not sure if this is the case in Latvia.
Thanks for the suggestion.
While 29er stuff is available here in Latvia, it isn't an issue as the kid is in Toledo, Ohio.