Drjuju-the usenet group rec.antiques.radio+phono is a great place to find TO owners. Two people you can ask are Peter Wieck (as he's the expert) and Ken Gooding (Ken G--who has more housebound Zeniths than TOs but probably could find one easily). After that would be
www.radioattic.com and I believe there may be one available right now in one of the member's ads (RA is a collective of repair and sales people not an auction for you to take your lumps on), Antique Radio Classifieds provides a one month previous look at the ARC classifieds (subscribing is of course the way to get the NOW)...
http://www.antiqueradio.com/classads_stat.html is what you need.