Rather than focusing on where to look, better to focus on how to download. Automation is your friend. There is software (like the *arrs) which automate the downloading of content from multiple locations online.
If only there was a megathread about piracy. Oh wait, here it is.
I’ve never had a problem with makemkv. I use it for everything. Even paid for a license lol.
https://redlib.ducks.party/r/Usenet/wiki/index