The best places are usually the official youtubes of the teams, leagues, or broadcasters. Basically the people who own the rights so they don't have to try to hide it from copyright claims by making them look terrible.
https://www.youtube.com/user/legacalcioserieatim/videos
https://www.youtube.com/user/INTER/videos
https://www.youtube.com/user/Foxsoccer/videos
Personally I find Lazio in the 90s and early 2000s the most entertaining, they really have the full package. Crazy amounts of money financed by a hometown businessman who would obviously go on to get arrested. A terrible stadium with a running track around the field. Fans that include a large group of violent openly fascist ultras. And to top it all off just an incredible collection of talent. One of their best players family was saved by famous paramilitary / war criminal (depending on who you ask) Arkan during the Yugoslav wars.
https://gentlemanultra.com/2016/12/0...f-a-dark-moon/