Amazon offers Prime members the HP X4000 Wireless Laser Mouse
in Black or Winter Blue for $16.35
with free shipping
. (Non-members can spend $49 to qualify for free shipping; otherwise, shipping costs $8.28.) That's the lowest total price we could find by $2. It features a 1600 dpi, LED battery indicator, and 30-foot wireless range. The included nano receiver allows for this mouse to be used with up to five HP-compatible devices at a time.