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Summer Sale trading cards are only available during the Summer Salien Event. There are six ways to get them:

Play the Salien Game
You can earn up to three trading cards each day by playing the Summer Salien game. Have fun and earn some rewards while you're at it!

Craft a Game Badge
Crafting a badge for any game during the sale will get you an additional Summer Sale trading card.

Make a Purchase
As an extra reward for purchasing, for every $10 USD spent during the sale, you’ll receive a Summer Sale trading card. From your Summer Sale badge page select

Go through your Discovery Queue
If you’re Steam Level 5 and above, you’ll get a Steam Summer Sale trading card once you view all the items in your daily Steam Discovery Queue. You can continue and go through your Discovery Queue two more times each day to get a maximum of three card drops each day. (If you reach Steam Level 5 before the end of the sale, you’ll be granted the cards you earned by exploring your Steam Discovery Queue during the sale).

Trade for them
That’s why they’re called trading cards! Find friends with other cards and make trades. Your summer sale badge page shows which friends have the cards you need.

Buy them from the Community Market
Sell the cards you don’t need and buy the ones you do, all with other Community members. Turn those duplicate cards into Steam Wallet funds to buy games.