I think they would be a throwaway item for a larger contractor. It's all part of the electrician's bid. More cost efficient to throw in a new one than carry them from job to job.
It might be a different story for a smaller contractor though. It wouldn't hurt to list it on CL under building materials or something similar.
They would come in pretty handy at a campground somewhere. Just pull your RV into the space and hook up the electricity.
Maybe a marina as well ?
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