Take a guess from 1 to 10.
Steam's "Summer Adventure 2014" features ten digital trading cards that you can collect to create a "Summer Sale 2014" badge. You can acquire those trading cards by:
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Purchasing from the Steam Store (1 card per $10 USD or equivalent).
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Crafting game badges.
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Voting in the Community’s Choice sale (1 card per 3 votes).
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Trading.
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Purchasing them in the Community Market.
Here's the minimum price of what those trading cards are currently selling for:
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Summer Adventure Card 1 - $0.40
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Summer Adventure Card 2 - $0.36
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Summer Adventure Card 3 - $0.34
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Summer Adventure Card 4 - $0.34
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Summer Adventure Card 5 - $0.34
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Summer Adventure Card 6 - $0.32
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Summer Adventure Card 7 - $0.34
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Summer Adventure Card 8 - $0.32
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Summer Adventure Card 9 - $0.32
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Summer Adventure Card 10 - $0.34
Steam's algorithm must have distributed less copies of the "Summer Adventure Card 1" to users in the first 3 days of that event.