I host a weekly 80s/90s obscure movie night (mostly Hong Kong action Z-movies, Godfrey Ho and the like) and RARBG has come in surprisingly clutch. If the movie got a HK theatrical release it's the first place I look. Japanese stuff too.
Other surprising sources: Tubi which often has better quality video processing for the stuff where the VHS/DVD master is all that exists (protip: yt-dlp works), and Internet Archive where people upload all kinds of stuff, including Blu-Ray rips.
A ton of stuff is also on YouTube but it's often a low-quality master and/or edited for content so it's usually a last resort.
Other surprising sources: Tubi which often has better quality video processing for the stuff where the VHS/DVD master is all that exists (protip: yt-dlp works), and Internet Archive where people upload all kinds of stuff, including Blu-Ray rips.
A ton of stuff is also on YouTube but it's often a low-quality master and/or edited for content so it's usually a last resort.