What should be done with replaced tender tanks?

Recently I heard that K-36's #487 tender was cut up at Antonito, and #484 and #488 are next to be replaced. And #315 tender tank at Durango will also be replaced per a recent post.
Isn't there any historic value or another use for these tanks rather that to be cut up and melted down? Could the tanks be of any value as future water car set asside for emergencies? Could the tanks be auctioned off to someone who wants to buy part of the narrow gauge? Can it be of advertising value to a motel or park display as a tank alone? Could they be of value to advertise the railroad on a road display?
The Mt Washington Cog RR did the same thing of dumping the scrap tank into the scrap pile, but they found that their old surplus coaches made great shelter at the top of sky lift and trails. They sold them and a helicopter delivered them.
These question are without knowing of the actual rusted condition of the tanks, but I sure would like to buy the Flying Rio Grande name from the part of the side sheet, or the number off the end sheet.