Source for paper-thin usb ribbon cables?

I have an imp on the April board that I’d like to power via USB, however, it will be sitting inside of a tightly sealed box. I’ve been trying to find a source for those internal cables (and connectors) that you see inside of phones and laptops, but haven’t had much luck (something like this Does anyone have any suggestions on where to find something like this?

Thank you!

Have you considered a Qi wireless charging setup, which would avoid having any cables through the case?