Marcos Maniacs

There's a 1971 Marcos Mantis (with a reserve price) for sale on eBay 
in the UK.

Details are :

http://cgi.ebay.co.uk/aw-cgi/eBayISAPI.dll?
ViewItem&item=1701268548&r=0&t=0&showTutorial=0&ed=1013793546&indexURL
=0&rd=1

There's no picture and little information, but the vendor can be 
contacted.

Worth a punt perhaps?

Cheers,

Mark