For some cards in premium/dual decks and a few others here and there, there are no prices. The zeros are in blue. Is this because the prices differ greatly or is something wrong?
My guess is no one has them for sale so no way to get a price. That's just a guess
If so then no one is selling a single card from Graveborn. :/
Maybe not because when you click on the price it doesn't open the page to buy cards
Sometimes prices for smaller runs of cards, such as prerelease giveaways, don't have enough sellers to create an average. You can usually find the prices if you go to TCGplayer, StarCityGames, or any other singles vendor online.
TCGplayer has no prices for foil decks such as Graveborn. My TODO list is aware of that.