Google left an obvious gap when it moved on from the Chromecast with Google TV. As imperfect as it was, the $50 price made it an affordable way to get a reliable Google TV streaming device — much more so than the $100 Google TV Streamer, the only streaming device Google currently sells.Thankfully, Walmart’s new Onn 4K Streaming Stick looks poised to fill that gap. The $30 dongle will offer cheap, simple streaming for those emotionally committed to Google TV, and for that crowd, it might be perfect.