I've never really dabbled with in game trading - do folks bother posting in a forum like this for minor items? I had a Vex drop last week and can finally make a HOTO - but haven't ever seen a Ko. Is it best to troll for one here (I have... lots... of pgems), or use chat in game, or what, for minor treasures?
You're probably best off creating a game on bnet titled '2 p ruby 4 ko' or something. This forum trades all items valueable, invalueable, and valueless. However, not as much of the valueless as it's fairly easy to get the need fulfilled on bnet in 10 seconds.
If you offer 2 p rubies for a Ko I bet you could get one within 5 minutes. Good luck with your HoTO, hope it rolls high!