Steam Community Market beta allows you to buy and sell items in Team Fortress 2

Valve are now letting you buy and sell items using real money and the Steam wallet. The new Community Market is currently in beta and only available for Team Fortress 2 but will soon be expanding to other games.It's quite the exciting thing.

Valve To Allow Other Developers To Split Profits With User-Generated Content Creators - Game Informer

TF2 - How to Find GREAT DEALS on Steam Market! (Live Walk-through)

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Steam's refund policy that bans you from using the Steam Community Market for 7 days has been expanded to include refunding mods purchased from the Steam Workshop : r/gaming

Steam Community Market now in Beta for Team Fortress 2

Steam Community Market Enters Beta - Game Informer

Download Steam for Windows, Mac, Android & Linux

Steam Team Fortress 2, Portal 2 In-Game Item Cross-Trading Is Now Live

Steam opens market for players to buy and sell in-game items with cash - The Verge

TF2 Community Market Tutorial

Team Fortress 2 - Wikipedia