Logitech Wireless Trackball M570 With Leave-in USB Receiver (910-001799) $39.99 fs @ amazon
 

Logitech Wireless Trackball M570 With Leave-in USB Receiver (910-001799) [amazon.com]

Technical Details

* Trackball comfort: Sculpted shape supports your hand and stays in one place move the cursor without moving your arm
* Logitech Unifying receiver: Connect up to six compatible wireless devices with one tiny receiver that stays in your laptop
* Long battery life: Go for up to 18 months without changing the included AA battery
* Smooth cursor control anywhere: Precision laser tracking on your desk, couch, bed or almost any other surface
* For Windows or Mac OS: Control your laptop, desktop computer or home theater PC wirelessly from up to 30 ft. away

:eek:

Usually ships within 1 to 3 months.
Ships from and sold by Amazon.com.

Apparently they just updated it...

Price: $52.25

In stock.
Processing takes an additional 3 to 4 days for orders from this seller.

Ships from and sold by PORTABLE GUY.

LOL price is changing fast on this one even for Amazon: showing $44.99 for me now from Amazon.

I wish I jumped on this. I can't find another wireless trackball mouse and this model usually goes for $50-$60. (I know Amazon is $45, but I'd rather go to Office Depot and pay $5 extra for a store near me).