h2g2 The Hitchhiker's Guide to the Galaxy: Earth Edition

The SRN4 hovercraft were made in the 60' to 80'. four of the 6 have been destroyed, and the last two are now in the National Hovercraft Museum, here in the UK. They use some 4 tonnes of aerocraft fuel an hour, and have a range of only 100 nautical miles ( 185 km. ) They also cost a fourtune, at several million pounds, over a decade ago, when they were already over 30 years old. That's even if they were for sale, which I am very glad to say, they're not.
Hoverspeed went in 2005.
If you wanted to buy a large hovercraft, the best people to ask would be Griffon Hoverwork, as they have a dedicated sales team, and can sell you new and second hand hovecraft from 6 to 180 seats.