I have a set of cylinders from my IO-360C1E6 that should be inexpensive to have overhauled. I needed a top overhaul and found a set yellow tagged and overhauled for a very reasonable price so I did not do my old ones. I have four with shipping boxes that include valves. The valves are probably all good but you would want them inspected and lapped. I remember that the cylinders are chrome but I should check. I had an A&P set the timing incorrectly not knowing my experimental airplane's engine had 10.5: pistons and that damaged the pistons, detonation I believe. The cylinders show slight vertical scoring but you cannot feel the scores. The cylinders are standard bore and measure within new limits with the proper taper as close as I could measure with an inside micrometer.
If you still need cylinders, email me and I will give you my phone # so we could talk.
Del Schier N197DL
delsjunk@comcast.net