If you are into robots you need to have a look at Ron’s TheOldRobots.org site. This Tomy Omnibot 2000 robot that Tomy made cost $600 back in 1984. In modern dollars that would work out to be around $1250.I remember seeing the ads and wanting one but at that price I can see why I never did get one. If you have one and want to make the second arm movable have a look at this page.