Zookeeper is my all-time favorite game. I had one in my house long before I ever owned any pins. Now it is just a cabinet housing a multicade, but at least I still get to play zookeeper on it. I've not seen another for sale since I found mine on e-bay over 10 years ago, I was going to buy a second if I saw one come up
If you are interested in the cabinet and possibly the old boards, let me know. The original monitor is long gone. I'm in Atlanta so may be too far but it's probably time to move it out of my house now that pins have taken it over...