Amazon.com: Microsoft Arc Touch Mouse (Black) - $29.99 + FSSS

Have had one of these for a few months, it's a pretty decent mouse for this price. Mine failed after a month of solid use, Microsoft replaced it right away with no hassle and no charge whatsoever. The only caution I give is this: If you've got carpal tunnel or other wrist problems, you'll probably want to use some sort of wrist support with this, if you're not already. For some reason, this mouse aggravated my wrist issues until I started using one. Other than that, it's pretty responsive and the battery life is decent as long as you remember to turn it off when you're not using it.