I’ve already described how much I like these little beasties. They’re perfect for embedded Asterisk hosts, FreeNAS, even as routers with a second NIC installed. I’ve found used ones on E-bay in the $100-200 range.
I was surprised to find that H-P has them in their refurbished inventory for $99-320. They have an offer of buy one get one 50% off at the moment. These are fully warrantied units sold as new but at a discount.
The most expensive one listed has 1 GB ram which is a lot for this sort of hardware. The least expensive has a 400MHz CPU, only 64 MB ram and a Linux OS. The middle range models are $249 and feature 1.5 GHz CPU, 512 MB RAM and 256 MB flash DOM.
These prices compare favorably against the latest hardware from Soekris Engineering. Especially if you consider the included case and power supply.
With the expansion case (E-Bay around $30) they will accept one PCI card which opens up a lot of possibilities.
Update: There seems to be some real interest in these devices. Some have indicated that the expansion case can be a bit hard to find. Josh Richards points out that the expansion case is in fact still a current product and H-P’s web site lists it here for $29.