The cheapest can often depend on what you have laying around.\n\nI have often made "network servers" with old computers laying around.  Simply find anything that can run LINUX or NT 4.0, and put your drives in it.  The computer does not have to be very powerful, anything 200 MHz or higher should do just fine.\n\nThis is also a "Green" solution, by recycling something that would have been thrown away otherwise.