Arkanoid spinners are rather limited as far as the number of games they can accurately play due to the fact that they are not weighted like a Tempest style spinner and they also use reduction/acceleration gears to change the speed of the encoder wheel. On a "playability" standpoint,they're really only good for paddle type games ie Arkanoid,Breakout ect.. They pop up on Ebay fairly frequently for well under $50.00 so unless you can get a hold of them super cheap and sell them in the $35.00 range then I wouldn't get my hopes up. You can always Ebay em as sometimes you'll get crazy bidders battling over stuff and you might make a good buck on some of them. It really all depends on how much you can get them for.