Not mechanical, but nice and cheap if you need a wireless solution.
http://www.staples.com/Dell-Wireless-Keyboard-Mouse-KM117/product_2456353Product Description:
Dell Wireless Keyboard & Mouse - KM117
Keep your workspace clean and clutter-free with reliable, plug & play wireless connectivity. Effortlessly connect your keyboard and mouse via 2.4GHz RF wireless with a nano dongle which easily connects to a USB port, for reliable daily performance.
Be productive with the Dell Wireless Keyboard and Mouse - KM117. Type comfortably on the full-sized keyboard with chiclet keys, which features a 3- section layout plus multimedia and hot keys.
Easily navigate your daily tasks with the optical mouse, designed for productivity and comfort.
Featuring a compact, sleek design, the Wireless Keyboard and Mouse are easily integrated into everyday desktop setups.
Keyboard Dimensions: 17.5 inches/445 mm x 5.6 inches/142 mm x 1.0 inches/25 mm
