The Motion Ads show you could order a Convt but were any ordered?? thats anyones but Joel's guess. I also want to say theres a DANA Convt out there as well but waiting on the paperwork on that one.
As for what the 68 Z Convt will bring is again anyones guess and unless its published on the auctions site as sold with a price listed, dont believe any outside prices you might hear about.