Microsoft Arc Touch Mouse $59
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Curve for Comfort; Flatten to Pack RR $79.95
"Enjoy stylish, compact comfort and reliable wireless freedom at your fingertips. Curve it comfortably for use. Then smoothly glide your finger up or down the scroll pad to navigate through a page and the Microsoft Arc Touch Mouse responds precisely to the speed of your movement. Use it just about anywhere, even on a rough wood surface or your living room carpet, relying on Microsoft BlueTrack Technology."
Wireless Compact Mouse - ideal for laptop.
http://www.microsoft.com/hardware/en-au/p/arc-touch-mouse