Shimano SM-RT66 Disk Brake Rotor, SLX/Deore.
This is unused but you will need to straighten it, which I believe is a reasonably straightforward job.
(This came on a new bike; the box shown is for the replacement rotor that I bought.)
Shimano 180mm Disc Rotor - unused, needs straightening (Kingsway)
This offer has been gifted to someone and is no longer available.