Staples has the Microsoft Wireless Optical Desktop 3000 for $25. Shipping is $10 or free on orders of $50 or more. Also use in store pick up to get free shipping.
Features:
* Enjoy wireless freedom and comfort
* Place your hands naturally and work comfortably using the distinctive and ergonomist-approved Comfort Curve design
* Tilt Wheel Scroll side to side, as well as up and down, smoothly and easily for a more efficient, comfortable work experience
* Media Keys and Hot Keys
* Average 6+ Months of Battery Life
* Enhanced F Keys
* Spill-Resistant Keyboard Design
* 4 AA alkaline batteries required (included)
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Microsoft Wireless Optical Desktop 3000 $25 + SH (Free In Tore Pick Up) 
