Ollie
You had any offers yet?
This is something I would be interested in as I would like to get my 1st rib, but don't have the funds for a new one, and quite fancy a project to work on.
As JK said in another post, Offer him a small figure. When he looks offended, then ask him how much he wants for it . . .
So the £1/£2 bracket looks good to me, How about £1.50
Finally, Have you got any more information?