But the 4K Ultra Short Throw Projector will be available in the U.S. this summer for $30,000 to $40,000.Going ProOne of the rowdiest booths belonged to GoPro, a Northern California-based maker of rugged, wearable cameras and mounts aimed at capturing live action shots of such things as surfing, mountain biking and motor racing.The company held periodic giveaways, and hyped up the crowds with cheer