Lenovo ThinkCentre Edge 2117EKU 18.5″ All-in-One Desktop for $299.99 shipped. Here is a screenshot for your reference. It features a 18.5″ LCD screen, Intel dual-core G2020 CPU, 2GB RAM, 500GB hard drive, and more. This works great as a secondary PC or a guest PC. Most places have it for about $540.