The best replacement for amazon instant video is netflix.

The best alternatives to amazon instant video are rated as following:
★★★★★  netflix
★★★★  itunes
★★  vudu
★  amazon prime
★  itunes movies
  google play movies
  prime instant video

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Speaking about amazon instant video, one probably shouldn't forget about amazon prime.

Other search terms related to amazon instant video and their ratings are:
★★★★★ amazon prime
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Google Trends

Scale is based on the average worldwide traffic of amazon instant video in all years. Click on graph for more.
amazon instant video
netflix
itunes