We saw a brief demo of Seiki's U-Vision HDMI cable back in January at CES, and now the $50 cable is officially on the market. When connected to your fancy 4K TV, the chord promises to up-convert HD content from your cable box or Blu-ray player to Technicolor-certified 4K Ultra HD. It's also capable of transforming 720p content to 1080p, all while using adaptive sharpening and noise reduction to keep the picture looking its best. The demo we saw at CES was pretty clean, but the reel didn't give us the opportunity to really put it through the paces -- something we'll definitely be looking to do now that it's available. If you want to give it a try, you can pick one up today at Amazon, Newegg and Fred Meyers stores.