Not sure how helpful this is but in the past I used a Firefox addon called check 4 change
You can let Firefox monitor a website in the background for change.
A con of this solution is that it only works when Firefox is running.
You could also try to maybe automate it with
Or something like this https://visualping.io/blog/how-to-be-alerted-when-someone-posts-on-facebook/
I spend about 300 euros on a really high end usb DAC for my desktop. I honestly don’t hear the difference between the desktop output and the expensive DAC. But I do totally hear the difference between a decent and cheap pair of headphones. I do still like my DAC because it’s able to power basically all large headphones and it also powers my speakers, so I don’t see it as money wasted.