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As others have noted, it's free-with-ads (at least in the U.S.) on IMDbTV, which is also available via Prime Video — and even with a free Amazon account (even without Prime membership) you can watch the show through the Prime Video web interface here:
This works for me
If you are in the US, fringe is free to stream with amazon prime or imdb freedive.
To clarify, Amazon Video still has it available for streaming purchase, but it is no longer part of Prime Video (i.e. free for Amazon Prime subscribers).