Unless you have Amazon Prime, seeing their “Instant Video” app on your Roku or other streaming device is just one big tease. Unless you sign up for the $99/year quick-shipping Prime option, Instant Video is useless. Though we’ve heard this kind of rumor before, it’s back, and from a new source. It seems Amazon may be prepping an ad-supported Instant Video layer, which would make their service free or very low-cost to use for those without Prime. The new video streaming offering is said to be part of an “overhaul” at Amazon’s media branch.