This trap card first hit the competitive scene as a prize card only available to the lucky few to win an officially-sanctioned tournament event, with fewer than 50 being offered to an exclusive selection of players who placed highly in official tournaments in the first half of 2007
As seen in an anime episode, Darkrai does not only cause nightmares
Cards that have been graded by professional grading companies such as PSA (Professional Sports Authenticator) and given high marks (eg PSA 10) are particularly valuable
You definitely should contact this service if you have a small shop selling cards
Other Versions For Sale Base - $32 Foil - $38 Showcase - $42 Borderless - $73 Prerelease Foil - $65 Showcase Foil - $89 Borderless Foil - $130
Opportunities: key character cards (Charizard, Pikachu, Eeveelutions) available at discounts, graded copies becoming accessible, and market shift back to fundamentals like artwork quality and true rarity rather than hype