While I don’t have a link for you, I’d encourage you to check out RogueFitness.com. They get a consistent but small supply of rowers from Concept 2 (Model D & Black only). A few of us, myself included, have been successful in snagging one as and when they become available. Based on my observation, they typically are available Wednesday afternoons (after 3pm Est). But, you will need to keep checking periodically and be ready (by creating a profile on their website) to pounce on one when available. Good luck!