Here is a red lab... His name is Marlan. Take a look. This pic is a good example of his colouring.
And since I have the chance, I'd like to add my two cents to this entire argument.
In my opinion, there is a difference between a litter of yellow pups that happens to have a couple dark ones in it and yellow labs that are specifically bred for their fox-red colour (amongst other qualities such as health, temperament, etc.).
I am not advocating for paying more or less for red labs, but I think there is a clear difference between what my pup looks like and just a darker yellow pup (Maybe not Cinnamon, since she looks quite dark in her pics). I know that there are good, reputable breeders out there who are selling healthy red labs.
I do not know if they are rare country-wide, but I do know that virtually nobody where i live in Canada has seen or heard of one. I do not go around telling people he is 'rare'. If they ask, I say he is red. If they continue to inquire, I always say that he is technically a yellow lab.