I was going to list my two on E-bay last year but with all the fees and then you had to specifically list Blackout Dates on them and explain that it wasn't FREE parking, just closer parking, it was more hastle and time consuming than the actual money (if any) you would make.
I ended up just giving them away to the first two people to PM me on this list. Depending on how popular (hot) they are when you list you may only break even. But don't dispare, people will buy almost anything on E-bay