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Calling it by meters would be like the imperial version series measuring in yards or feet. Just doesn't happen that way :)
If you really want to dumb it down because there are too many digits you would say 2.997 x 10^8 m/s
Kilometres, millimetres, nanometres are derivative units - that's why they have "metres" in their name.
I agree- using Km/s would have removed any ambiguity, but a) the original poster incorrectly used m/s and b) the stuff I already said about SI units.
When you get to those sort of numbers, it doesn't matter whether you use miles, metres, kilometres or inches. The numbers are so vast, you simply can't visualise them.