VicTsingDirect via Amazon offers the VicTsing MM057 Wireless Mouse in Black, model no. VS1-CA57B, for $10.99. Coupon code "FNVMNUTR" cuts it to $7.99. Plus, Prime members bag free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, shipping costs $8.12.) That's the lowest total price we could find by $5. It features up to 2,400 dpi and purports to have up to a 15-month battery life.