Vudu has a box, or they used to. A while back, the only way you could watch Vudu was if you had their box, which I still have somewhere. I think Roku or Google will release their own box to play 4k content, but it'll offer 4K from a number of sources. Google used to offer their service through a Western Digital box, but we'll see what happens. This kind of reminds me of when DVDs were released and you had to choose from either Blu Ray or HD DVD. Same with VHS and Betamax. Hopefully we won't end up with a stack of boxes that all offer a different service.