These are readily available for such purposes. Your case fans need very little current so get a Y connector and attach both to one power source.
I started building my computer the other day, and it was all going fine until I realized that my PSU (pre installed into the case) was without a 6 pin connector for my Graphics Card. My graphics card did come with a 2 molex to 6 pin Adapter except both of my molex's (my PSU only has 2) are being used by my case fans. I'm worried about running the build without case fans. Is there anything I can do to fix this?!?!?! I need both my case fans and my graphics card powered so... I'm stumped. PLEASE HELP ASAP... need this build ASAP. Thanks so much!

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