Microsoft 2CF00002 Wireless 1000 Optical Mouse (Black) for $8.95 shipped after promo code EMCNDJA55.  Here is a screenshot for your reference.  It features 2.4GHz wireless connection with up to a 15' range, snap-in transceiver, 1000 dpi, scroll wheel, and includes 2 AA alkaline batteries.  Most places have it for about $24.