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Re:Python Machine Learning by tedmiston on Monday December 05, 2016 @12:31PM (#13107226)
A site that's pretty good at that is Change Detection [1]. You even get daily emails and change logs for free.

[1]: https://www.changedetection.com/

Re:Python Machine Learning by davidkohcw on Monday December 05, 2016 @04:14PM (#13109661)
Thanks for the tip. I just implemented it and it said 44 other people are monitoring that page haha.