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Well, I have a key that includes Poker Night at Inventory along with other Telltale games... If you want I can trade it for the cards...
The key is valued at $1 since that's the lowest you can get it for, and Faerie Solitaire cards are valued around $0.40 each in the Steam market, so I'm thinking 2 or 3 cards should be enough, does that work for you?