The folks over at Sonniss release a pack of royalty-free sounds every year, to celebrate the annual GDC. It’s really high-quality and has a big variety too, so go check it out if you haven’t already:
- http://sonniss.com/GameAudioGDC.torrent (couldn’t find a download link on the page) (~10 GB)
- https://sonniss.com/gameaudiogdc2016/ (~15 GB)
- https://sonniss.com/gameaudiogdc2017/ (~20 GB)
- https://sonniss.com/gameaudiogdc18/ (~32 GB)
All of them sum up to about 80 GB though, so free up some space on your disk if you are willing to download all of them.
Here’s the license, if you are interested: