SOR has them on clearance right now. Factory option in non-USA cruisers. I never would have thought it was an option. Even has refridgerant lines. Close to $500, but pretty cool. Hope it's not a repost.
http://www.sor.com/sor/cat801.tam?xax=13527&loop=y&case=FJ6062&uu=786156
http://www.sor.com/sor/cat801.tam?xax=13527&loop=y&case=FJ6062&uu=786156