Ebay offers Logitech M170 Wireless Compact Ambidextrous Mouse for $9.99 with free shipping.

Product Description:
With Logitech M170 Wireless Mouse, choose the reliability of a cord with the convenience of wireless and a 33-foot range thanks to Logitech Advanced 2.4 GHz wireless technology. This affordable mouse works for up to 12 months on a single AA battery. Set up is simple just plug the tiny wireless receiver into a USB slot. There's no hassle with pairing or software installation, and M170 is compatible with Windows, Mac, Linux and Chrome.