Its usually legit if its sold by a reputable seller. Amazon have them too.
I'm not sure if the rMBP needs a different applecare though as the ones I have seen just say 'Apple Care Protection For MacBook Pro' but if you add apple care at checkout on the apple website it specifically says 'Retina'.
I used to buy all my AppleCare off eBay but not anymore. One poster said you can lie about where you got it, but Apple specifically says they can demand to see proof of purchase in the agreement you get when you register. Google around and you can find stories of people being asked for this, and told eBay doesn't cut it.
So, just because the agreement registers fine is not a guarantee of coverage.
Will it probably all be fine? Sure. Is there risk? Yes.
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