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Refurbished: Logitech MK550 Black USB RF Wireless Ergonomic Wave Combo (K350 + M510) [newegg.com]
Price = $ 28.99 w/ Free shipping

product details (from amazon)

• The Wave Combo MK550 includes the K350 model keyboard and M510 Mouse
• Powerful 2.4 GHz wireless connection with one tiny Unifying receiver that stays in your notebook
• Contoured laser mouse with rubber grips gives you smooth, precise cursor control
• Wave-design ergonomic keyboard with cushioned palm rest for exceptional typing comfort
• Virtually no battery changes ? up to three years of battery life for the keyboard and two years for the mouse* (* Keyboard and mouse battery life may vary based on user and computing conditions.)
• Operate up to 30 feet (10 meters) with the receiver in clear sight of the keyboard and mouse