Online video set-top boxes now rival smartphones for rumor mongering: Hot on the heels of the new $50 Roku Streaming Stick debut last week come yet more rumors that Amazon is planning to release its own set-top box for streaming video and music. That comes amid buzz about a possible new Apple TV. Plus, today (March 13), Amazon upped the price of Amazon Prime, the service you need in order to watch Amazons exclusive and unlimited streaming content (including four brand-new shows), from $79 to $99 per year.