That is a big machine and at 650 pounds probably not very desireable to a lot of people! In good running condition it would probably be a great machine for the garage but I wouldn't plan on lugging it up and down any stairs!
Offer low but I peronally would look for something smaller. There are a lot of Cavalier 64's and Vendo 63's out there at good prices. They are very servicable machines, can vend multiple products and they weigh about half as much as this monster.
Move that thing once and you will sound like Dr. Zachary Smith from "Lost in Space" - -
"My poor aching back!!!"
Tim