Unfortunately, they are very hard to come by. You are the 3rd or 4th person this season I know of looking for that same unit. I searched eBay for you and found nothing. Not even new. Other places to watch are pwctoday they have a good parts classified section and greenhulk. Also post it in there Yamaha sections. If someone is parting one out or has it they'll message you. And it's more likely to be seen there then posting wtb in classifieds.
It is still available new but it's about $800. Babbittsonline or partzilla still list it. Used in working good condition your looking at probably around $400/500.