Hello, Is there a free alternative to this website changedetection.io ?

I am looking for changes to the site, specifically I am waiting for the shop/stores to do a promotion, i.e. lower the price on a product I am interested in.

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I am looking for something free that will send me a notification on my phone/email/telegram etc.

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These plug-ins from github are out of the question, because I don’t even know how to run them and I’m not always at home, so that the server (my computer) is always on and watching the sites.