Remember folks, if you have an issue with the price of an item message the seller. The rules state, and have always stated that price policing posts and all other rule violations will be deleted.
I personally think this price isn't bad given the fact CNT sells these at bottom dollar to undercut the competition already. It's not like a used DP is "worn" in any way...it's a hollow tube with bungs added onto it and a bracket. Clean it up and it's no different than brand new just about.