The one thing that the CDN gets right is mint set values. Actually even if they were wrong the sets would still trade at CDN. Most dealers buy at about 80% of bid and sell at bid but if you're patient you can always find someone who'll pay bid or a little more. Mint sets are increasingly trading at retail prices which can be double or triple bid so it might be a good idea to watch these markets closely. If you don't have CDN numbers just look at Jakesmarketplace. They stay very up to date with prices and tend to be around 25% over bid.
