Use Newegg coupon code EMCJJJF56
Newegg has this NETGEAR ReadyNAS Ultra 4-bay NAS Enclosure for $529.99 after instant savings. Shipping is free. Apply the coupon code to drop the price down to $469.99. It features three USB 2.0 ports, four SATA interfaces, 1GB DDR SODIMM memory, Intel Atom processor, supports RAID 0, 1, 5 & JBOD and comes with a 3 year warranty. TigerDirect
has this same enclosure for $599.99.