Price/value depends largely on location, so it helps to know where youre located at. In the Northeast, $1000 is rather high for a Jet, but Im sure the members in the Southwest might think its rather low. That being said, its your father-in-law and he's in poor health, so I wouldnt be dickering too much unless you really hate the guy.
"I am, and ever will be, a white-socks, pocket-protector, nerdy engineer -- born under the second law of thermodynamics, steeped in the steam tables, in love with free-body diagrams, transformed by Laplace, and propelled by compressible flow."