I have a
Kensington Turbo Mouse Pro USB trackball that I cannot use anymore. I used it for about a month and loved it, but then got a new desk...well, the keyboard tray isn't as big as the old one and hence the trackball didn't fit as well. Note this is *not* the wireless or optical model.
Last check on eBay showed this going in the $45us range...still lists for $109.99 at Kensington....I am looking for $35 + shipping (from Canada) - I've all the original box and docs. Payment via Paypal.
Email me at reverse dot biased at gmail dot com if you are interested