True Bluetooth Trackballs?

danaris asks: "I've been using a Logitech Cordless TrackMan with my PowerBook for some time now, and I'm very happy with it, except for one thing: I still have to plug it in. Not the trackball itself, of course, but the receiver. Now that I have a laptop with built-in Bluetooth, I'd really like to be able to use a trackball that doesn't -have- a receiver. However, after hours of searching, I found exactly one trackball (from MacMice) that uses Bluetooth, and it's not exactly what I'm looking for. It looks very awkward for someone used to the TrackMan, and (the killer) it only has 2 buttons. If I'm getting a brand-new Bluetooth trackball, I'm not settling for anything less than 4-5 buttons (the TrackMan has 8). So, has anyone else have better luck than me in finding such a thing?"