The 5 port SATA backplanes were the hardest part to find when I built these. You can get them through http://www.chyangfun.com/ http://www.chyangfun.com/ which

The 5 port SATA backplanes were the hardest part to find when I built these. You can get them through http://www.chyangfun.com/ http://www.chyangfun.com/ which is who Backblaze gets them through and we did too. They are hard to get ahold of sometimes so that's why I was looking around and found some shady companies selling them. Protocase mentioned above sells these which would probably be the easiest company to get these through. Other than this, the other parts are pretty standard and are easy to find with some simple searching.