Don't give up hope there have been a few for sale on eBay within the past year, keep checking from time to time.
Also since you are looking for a 54" you may find someone that is looking to upgrade to a 60" and be willing to part with their smaller mower.
Call all of the Kubota dealers in your area and see if anyone has traded one in.
And if all else fails why not buy a new one, they are not that expensive.
Ken /forums/images/graemlins/smile.gif