Amazon.com : Lenovo ThinkCentre M73 10B60008US Desktop (3.2 GHz Intel Core i5-4570 Processor, 4 GB RAM, 500 GB Hard Drive, DVD-Writer, Windows 7/8 Pro

$559
Amazon.com : Lenovo ThinkCentre M73 10B60008US Desktop (3.2 GHz Intel Core i5-4570 Processor, 4 GB RAM, 500 GB Hard Drive, DVD-Writer, Windows 7/8 Pro 64-bit) Black : Desktop Computers : Computers & Accessories