We trade cards.

I'm proud to say that this is the first group dedicated to Steam card trading.

Steam Trading Cards is still in beta, and you can choose to opt into the beta early by:

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1. Buying a beta entry off Steam Community Market.
2. Joining the official group here will enter you into a queue to give you a beta entry for free, as well as three extra copies to sell/give to friends.
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Create a forum post / comment in this group to advertise your card sales.

Invite your friends to help this grow!

Official Steam Group
Steam Trading Cards FAQ