Surface Arc Mouse - $69.99
If you are looking for the ultimate travel mouse, buy the Surface Arc Mouse.
It’s called the Arc Mouse because you bend its skeleton to turn it on and flatten it to turn it off. This design gives you a travel mouse that’s somewhat ergonomic and still disappears in your bag or pocket when you aren't using it. The Arc Mouse communicates with your PC through Bluetooth 4.0.
It doesn’t look like it at first glance, but the Surface Arc Mouse has the buttons you need. Pushing down on the left or right side of the mouse’s front activates left-click and right-click. You scroll by stroking this same touch-sensitive panel with your finger.
The Surface Arc Mouse comes in blue, black, silver and burgundy. Amazon sells it for $69.99.