It seems that one is for sale. From IO9:
How much would you pay for a Nobel Prize medal?
Nobody has tried to sell a Nobel medal in 70 years, so the final price will establish a new and interesting precedent as far as these things go.
ABC News reports on the motivations behind the sale.
Of course after the ribbing he must have taken after this full page ad appeared in the PSU student newspaper, he may no longer be interested.
- Nobel Prize medal for discovery of DNA structure to be sold (science.nbcnews.com)
- For Sale: Famed Nobel Medal for Discovery of DNA’s Structure (livescience.com)
- Nobel Prize for Sale (abcnews.go.com)