Staples has an interesting Windows 8 Trade up to Touch program running where you can earn you a little cash back and have the opportunity to recycle your old computer in the process.
When you buy a qualifying touch screen laptop or tablet at Staples, just fill in the online claim form within fourteen days and you'll receive a prepaid shipping label to turn in your older, qualifying device. Just pack up the old computer, drop it off at UPS and within thirty days you'll receive a pre-paid VISA card for up to $400.
Qualifying touch screen Windows 8 devices include the Surface RT and Pro, the Acer V5 laptop, Lenovo YOGA Ultrabook, and HP ENVY TouchSmart desktop. The trade in values range from $100 for any notebook or netbook computer up to $400 for any notebook powered by an Intel i7 or AMD FX processor. Trade in devices must be fully operational, include the main battery and power supply, must not be permanently marked or defaced, and must be complete and undamaged. Reasonable wear and tear is accepted.
You can find all the details and fine print here at Staple's Trade up to Touch web pages.
Thanks, ninjaap, for the tip!