The Steam  Link allows you to stream your Steam library anywhere in your house, while the Steam controller enables controller playback for games that otherwise wouldn't have it. Each serves a crucial role in furthering the PC gaming in a living room movement that's been going on the past couple of years, and Gamestop has each on sale for a significant discount. The Steam Controller and Steam Link are each down to $35 right now. If you've been wanting to try out the Steam controller, this is the absolutely cheapest way to do so - there's no word on when this price will change though, so snag it while you can.