Amazon.com: StarTech.com 6in LP4 to 6 Pin PCI Express Video Card Power Cable Adapter - Power adapter - 4 pin internal power (M) to 6 pin PCIe power (M) - 6 in - LP4PCIEXADAP : Electronics
Amazon.com: Cable Matters 2-Pack 8 Pin to SATA Power Cable (SATA to 8 Pin PCIe) - 5 Inches : Electronics
2.5mm Pitch 2-pin Cable Matching Pair - JST XH compatible : ID 4872 : $0.95 : Adafruit Industries, Unique & fun DIY electronics and kits