I have seen more than usual on the bay for for the last couple of weeks but most people are asking a lot as the starting price, up to ($1700) so I think there's a backlog at the moment. I can not tell if this is more to do with the MKV or the general economy. I am on the fence at the moment, almost ordered a MkV at my local GC over the weekend but the sales guy was less than helpful, actually he was a tool, so I walked away. I will not be selling either of my MkIVs, they are just too good of an amp. I have had my short head 16 years and it works and sounds just as good as my new combo. Both of them sound as good as the Axe-Fx but the Axe can nail every other amp I have ever had, including the Roadking, VH4s and Engl SE.
Having said all that I will be ordering a MKV soon, said the blind man waving his wooden leg aloft.