The Seattle-based e-commerce giant quietly boosted its Video on Demand offerings last year by rolling out an unlimited movie streaming service, not as a standalone option, but as part of the company's already popular $79-a-year Amazon Prime membership. It also just inked a deal with Viacom that boosts its catalog to over 15,000 videos, or three times what the service launched with. Pair that with the low price of the Kindle Fire, the free month of Prime that comes with it, and user growth is all but certain. Before the tablet launched, Piper Jaffray analyst Eugene Munster predicted the number of Prime users is growing 20% year-over-year, bringing the estimated number of Prime users at the end of 2012 to 6 million.
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