Ahh, so you're the one who knocked my bid off!

That was actually the second listing for those P&G tbs. I bid the first time and got it for $20, then he told me I could get up to 8 at the same price. Stupid me I only asked for 4, then when I got them I was kicking myself for not getting the whole kit & kaboodle. Then just as I was about to send the guy an email asking if I could go ahead and get the other 4 I saw he had just relisted them on ebay.
They are nice and compact trackballs, would've been perfect for the miniWilliams and miniGeekenstein (instead had already ordered the iBall and Ultimarc 2-1/4", which ended up working out great based on the artwork). They roll smooth too. I had a cheapo USB cable lying around ($1.99 from Fry's) so I tested one of the P&Gs out with XP and it came up as a Crystal Mouse. Seemed to work just fine. Nannuu bought two of the ones I got (ended up getting them for $22 each shipped, $20 per tb plus $8 shipping) and I kept the other two. I plan on using them for a couple of mini cabs I want to put together for my brothers. If the miniWilliams works out well then will base those two cabs on that, only taller so an adult can play without sitting down.