Could anything that could be described as the compression chamber needing replaced have the potential to be terminal and unrepairable, making these just parts donors?
Maybe they just need reseal.
WAYYYYYY over priced. I'd offer him $25 and have him pay for your gas money. Just kidding, it is a more than resonable price. If I weren't getting rid of some of mine and taking a break from it I would be buying them if I had a chance.