I can't tell you where to get one, but you will probably want to look for an appliance extension cord, like for a fridge or window a/c. That is the only one I've seen that is actually 3 prong, and not blue, orange or yellow. Not sure if you can get them in that length though. Might be easier to find some raceway as suggested, and maybe paint it.
I looked at the appliance extension cords. The longest was 4.5m. I needed 10m. I ended up getting a black 10m extension. Eventually an outlet will be installed but at least the extension can be re-used elsewhere when that time comes.
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