To search for a package, in the main repo or the AUR:
$ paru -Ss search-term
With the search results, it clearly labels if something is from the AUR or extras or the main repo, and you can make it show AUR results first or last in the config.
Not sure why noone has pointed this out but if you use paru or yay instead of pacman, installing/searching the AUR is the same as if they are in the main repo. It does all the building etc for you.
Exactly this, except I actually stopped for a long time when Netflix first came out and wasn't geo-restricted.. then the enshittification started.