Sans Digital TR4M+BNC 4-Bay eSATA Port Multiplier Tower Storage Enclosure for $59.49 shipped after code SANS15HOLIDAY. Here is a screenshot for your reference. It features eSATA interface and provides the ability to access four SATA hard drives via single eSATA connection. Most places have it for about $79 or much more.
Originally posted earlier, this post has been revised and is just a friendly reminder.