NORCO DS-500B external SATA (eSATA) Storage Array RAID Subsystem with built-in Port Multiplier and eSATA host interface, supports both 1.5 Gb/s and 3Gb/s Serial ATA transfer rates. Connected to a eSATA PCI-X/PCI card, this subsystem gives your more than 10 times the data transfer speed of an average Network-attached storage (NAS) and massive hard drive space capability. It supports RAID 0, 1, 5, 0+1, JBOD functions, providing a protected, easy to manage, cost effective storage solution.
HP Servers:
DL380 G2 - $50
DL380 G4 x 2 - $150/ea
Cobalt:
RaQ 3 and 4's - Free to good home
Generic Servers:
Dual AMD 2200 beige box with 8G RAM, SCSI - $30/ea
TONS of CAT 5E
I'll add more soon...