http://www.ebay.com.au/itm/2M-10-way...item20cdd334f0
There's a quick example using my google expert powers. You'd have to find something in the ampage rating you're after. Lots of those old computer towers laying around have ribbon cords in them, but usually in short lengths.

It good to have a silly question thread, I may be asking a few of those. Asking a silly question saves making a silly mistake.