Inexpensive dual voltage power supply from SparkFun. I'm incorporating it into a project, so thought I'd share the model. I bought it here: http://www.sparkfun.com/products/11296
Note: the molex 4 pin connector is derived from the Molex 3D cad drawing and is slightly larger than the product in hand. It works with out-from-the-computer female connector, so I don't bother to make perfect. The rest of it is externally accurate.