Neil Gaiman and Terry Pratchett have sold Terry Gilliam the film rights to Good Omens—for a groat. The deal requires an actual groat, not the equivalent in other coins.
An eBay search found groats from Edward III through Victoria, as well as a "hammered silver half groat" of Elizabeth I, and lots of baseball cards.
And I don't believe they've actually made groats, which is an old English coin worth about fourpence, since about the 1780s. Which means he is going to have to go to EBay.RU [Sirius, interviewing Gaiman]: He's going to have to do some searching… a magical quest.
GAIMAN: I mean frankly they're really cheap. We figured out we were going to need Farthings to pay the agent commission on a groat. I went to EBay and picked up a farthing for practically nothing.
An eBay search found groats from Edward III through Victoria, as well as a "hammered silver half groat" of Elizabeth I, and lots of baseball cards.