Today. Best Buy has the Logitech Wireless Performance Mouse MX Sale Priced at $39.99 with Free Shipping. While supplies last...may sell out. Highly rated. Next lowest price is $52 at amazon.

Great reviews almost everywhere: 4.5 of 5 stars at Staples, 4 of 5 at Amazon, and when Cnet reviewed it they gave it 5 of 5 stars saying, "...this high-end input device has enough features and cushy design to make it a justifiable indulgence for anyone who takes their cursor control seriously." Of note, it may not be supported in Windows 8.1; check Logitech site for updated drivers.

• Mouse anywhere, even on glass
• Nano-receiver
• Precision cursor control
• Windows and Mac compatible
• 3-year warranty