Newegg offers the Gateway One AMD Quad-Core 1.5GHz 19.5" All-in-One Desktop PC, model no. ZX4270, for $299.99 with free shipping. That's $20 below our February mention and the lowest total price we've seen. (It's a current low of $130.) It features an AMD A4-5000 Quad-Core 1.5GHz processor, 19.5" 1600x900 LCD, 4GB RAM, 500GB hard drive, DVD burner, 802.11n wireless, USB, and Windows 8.1.
Are you throwing away money? Before tossing these items that are considered disposable, consider how to give them new purpose.