Newegg offers the Rosewill 5-Button Right Handed Wireless Optical Mouse in Black, model no. RM-7800BL, for $10. Redeem this $10 mail-in rebate to cut that to $0. With free shipping, that's the lowest total price we could find by $10. It features three sensitivity settings (up to 1,600dpi) and a USB interface. Deal ends December 8.