Ctenophorus clayii are to the best of my knowledge no longer in private collections in the hobby. To be honest I have been collecting dragons for well over 20 years and have only ever known one individual who had these legally on a keepers permit. The Gibber dragons I think you are referring to that have come up for sale once or twice in the past are not Ctenophorus gibba but the Gibber earless dragon also known as the Smooth Snouted Earless dragon, Tympanocryptis intima. These are also very rare in captivity and extremely hard to find. I have not had these in my own collection now for well over 12 months and am finding them very hard to replace. You never know what is floating around out there in the hobby and who has what but I am not aware of anyone that has legally kept C. gibba in recent times, say last 5 years or so.