We got an Esvo tent from these guys who do the Karstens in the UK too;
http://www.campingtravelstore.co.uk/karsten-inflatable-tents
(videos on that page are good)
We went to one of their display days and they were possibly the most helpful, knowledgeable and enthusiastic people I’ve ever dealt with – they made a real effort to understand what we wanted, spent a long time with us looking at various options/configurations on different tents, warned us away from a few that weren’t as suitable. Couldn’t praise them more highly.
They’re on FB too and there’s a Karsten UK group on FB they run.