Today only. Newegg has the Sans Digital TR5M+B RAID 0/1/10/5/JBOD 5-Bay Data Storage Subsystem w/ 6Gb/s dual-port eSATA PCIe Controller Card + Western Digital Caviar Green WD20EARX 2TB SATA 3.0Gb/s 3.5" Internal Hard Drive for $240 with free shipping. This accesses five hard drives using only one cable and support hot-swappable SATA I and SATA II. 
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Thanks, NewEgg, for facilitating problems for users who don't do their research. Sans Digital specifically says NO GREEN DRIVES in this otherwise you will have problems, and of course, they bundle it with a green drive. rodeo cowboy.
Link please?
The green drives should work OK in this enclosure, but depending on the RAID configuration, partition layout, file system used the performance may not be as advertised. SansDigital simply says "don't use the green drives" as an easy way out not to investigate the real problems. I spent several months on their enclosures to realize that the performance issues had nothing to do with the green drives (the default reply was "use the tested drives for $500 a piece to see if performance increases"). If you are trying to use JBOD or run drives as independent, any drives will be OK. If you run RAID5, the performance may be bad if the stripes are not aligned with sectors for a given layout and the number of drives.
^ Well there may be another reason, Green drives have TLER disabled which can be a problem in a RAID array, though many other desktop grade drives do also.