Seek an old laptop - perhaps even one with a dead screen
(if it can use a monitor for setup).

The Qube's are also cool - and they look nice out in view.

Quoting David W. Talmage (talmage@madison.onespeeddave.com):
> I'm seeking recommendations for a quiet, inexpensive {file, print,
> dhcp} server that I can stick in a closet and forget about.  I'd like
> it to run NetBSD.  I'd like it to have 10/100 Ethernet.  My budget is
> about $200, not including hard drives.
> 
> It would be OK if the thing doesn't have any internal disks as long as
> it could read from a spare USB2 hard drive that I have.
> 
> I'm considering a Cobalt Qube 2.  They're available on EBay for
> between $200 and $300.