Here is one on ebay for $40 plus shipping.
About $3K miles on it. Fortunately for us, there are lots of people out there that buy a motorcycle, ride it for a few weeks, get scared, then let it sit for 10 years. Those bikes sometimes get bought by the online salvage dealers.
EDIT: Kawasaki says the cylinders are replaceable, but I don't know anyone who has actually done it. I'm just guessing when I say they have to be pressed in and out because there is nothing in the manual that says so. It could just as easily be done with temperature variations. In either case, the manual shows replacement o-rings that are used as gaskets for the cylinder to housing connection.