Where can I buy a Red Blue Green Cords (female) to HDMI cord?

red blue green is "component" video and there is no direct conversion to HD or direct to HDMI cable . you would need a converter box with upscaling depending on which way you want to go

If there is such a thing, it would be particular for the device the HDMI side plugs into, so you need to get what the manufacurer of that device has available.

Otherwise, there is no such thing as a cable. What you need is a coverter box to convert the one signal type to another.

apples and oranges, you need a level converter.

try www.parts-express.com