Power Supply Cables

I have a Thermaltake Black Widow 850W modular power supply in my current computer. I have been looking for hours trying to find the right product for my question.

http://www.newegg.com/Product/Produc...82E16817153106

My PSU uses 8-pin PCI-e power to power all connected devices (ex. 8-pin PCI-e connection at the PSU to a cable with SATA connectors for hard drives, etc).

My question is: are there cables somewhere that are PCI-e (6 pin or 8-pin) to cables with SATA connectors on the other end to power HDD?

All I can find are cables that are SATA to PCI-e (the cable that is connected to the PSU is SATA and transfers the power to a device using a PCI-e like a GPU)

http://cdw.com