I sold one in the last 24 hours. The thing that surprised me was this sub is only a couple of months old...no "b" stock available and most folks aren't going to "turn it over" this quickly-bottomline: the used market is extremely limited, if any at all....buyers were pricing it as if it was a couple of years old and there were a ton of other sellers out there.
My advice to you is when you find one, jump on it.