Dell Home offers the Dell Inspiron 20 Signature Edition Intel Celeron 2.16GHz 19.5" All-in-One Desktop PC in Black, model no. 3043-1252BLK, for $299.99 with free shipping. That's $150 off list and the lowest total price we could find for a similar Dell Inspiron 20" all-in-one desktop by $30. It features an Intel Celeron N2830 2.16GHz dual-core processor, 19.5" 1600x900 LED-backlit LCD, 4GB RAM, 500GB hard drive, 802.11n wireless, 720p webcam, card reader, USB 3.0, HDMI, Bluetooth, and Windows 8.1 64-bit with Bing.
Update: Specs corrected.