@ mjg59
You say you dread to think how much it would cost to post to the USA. I would suggest you hunt around, not just with royal mail, to see what sort of price you can get. Then weigh that (no pun intended

against the fact that you will probably never be able to get another machine like it ever.
You would probably get a fair bit for it on ebay but most likely less than its true worth to you as only so many people can see it in a week!