The $0 price is right but is it useful or a negative? Does it provide a convenient 12 v outlet for a portable air pump or something else useful, or is it just a plastic cup with a lid on it? If it is a plastic cup/lid, does it “use” one of the two cup holders so we are only left with one? TU.

 

1. A cigarette lighter replaces the plastic dummy plug in the 12V outlet.
2. You get a free cup/ashtray with a lid, which you can use or remove completely.

It's a low risk, low reward option.