As part of a selection of charity auctions to raise money for Sightsavers, this beauty has popped up:
https://www.ebay.co.uk/itm/Tour-of-the-Crystal-Maze-game-show-set-with-host-Richard-Ayoade/123652606588?hash=item1cca450a7c:g:wZoAAOSw~jJcaslC:rk:1:pf:0
"Fiendish challenges, glittering crystals and the famed Crystal Dome: our winner will join host Richard Ayoade on a personal tour of this fantastic game show set. You'll get the chance to visit the Aztec, Medieval, Industrial and Futuristic zones for a peek behind the scenes as Richard guides you through the maze.
Winner must be available between 1-12 April 2019 (weekdays only). Prize also includes a Crystal Maze goody bag, which means you'll be taking home your very own crystal! Depending on the ability of the winner, you'll also be able to try out a game or two. The prize will last no longer than an hour and take place at Bottleyard Studios in Bristol."
Be aware the experience is for one person only, so there's no point clubbing together as a group to outbid others. But if you've got something you can afford to donate and want a hell of a TCM experience, have a look.