WARNING.... There are those out there who are advertising "Silver" Lab puppies for sale. The are asking extremely high prices for these puppies, $1000 plus when normal colors go for under 500.
Silver is not a color that is recognized by AKC, the only 3 colors are black, chocolate and yellow. It is considered a serious fault if a pure bred puppy from AKC parents is born silver or gray. It is recommended that if a pup is born silver that it be sold with limited registration or as a pet only and NOT be bred. That color is not recognized by AKC and they would not be eligible for any AKC shows. There is not even a silver color selection on a Lab's registration application.
It is also rumored to NOT be a purebred lab, but a cross of Lab and Wiemeraner (sp?)
Be cautious of breeders offering these color of Labradors.
For more information, see the link below
Wing-N-Wave Labradors: Labrador Coat Color Controversy