This appears to be the best deal I've seen, but with a jumbled description... opinions?:
Dell OptiPlex 780 PC Desktop - Customized
US $229.99 Free shipping
Condition: Manufacturer refurbished : Split the cost with friends
Seller Notes: “Units may have scratches or wear. There is no defects in operation.”
Brand: Dell
Operating System: Windows 7
Model: OptiPlex 780
Processor Type: Intel Core 2 Duo
Type: PC Desktop
Processor
Speed: 3.00 GHz
Graphics Processing Type: Integrated/On-Board Graphics
Memory: 8 GB
Product Line: Optiplex
Hard Drive Capacity: 160 GB
MPN: 780
Operating System Edition: Professional
Product Information
The Dell OptiPlex 780 desktop has been customized by the seller, so read the detailed listing and feel free to reach out to the seller to ask questions about specific adjustments. Without any modifications, this OptiPlex customized desktop is powered by the Intel Core 2 Duo E7500 2.93 GHz processor that lets you multi task with ease. Moreover, with a DDR3 SDRAM of 2 GB, the Dell OptiPlex 780 desktop facilitates an enhanced computing performance and fast rebooting. Boasting a 250 GB HDD capacity, this OptiPlex customized desktop lets you store ample digitized videos, photos, and music in high-definition formats. What’s more, get an exceptional experience of playing your favorite high-end games on the Dell OptiPlex 780 desktop as it features an Intel GMA 4500 graphic card.
Dell Slim Desktop CD/DVD Burner
Windows 7 Pro 64-bit 8 GB RAM DDR3 Intel Core 2 Duo Processor @ 3.0 GHz (E8400)
...and, based on q&a, it has 8 USB2.0 ports, was built in 2010 and is very quiet... I hate buying
anything on eBay, but it's sometimes unignorable.