Disclosure: This is a totally unpaid and unbiased recommendation of something I have recently found.
I stumbled across
Audio Design Desk
recently and ended up buying the Lifetime Licence, as I HATE subscription licensing. I would not want to reiterate stuff already on YouTube and on the site, but I can recommend anyone to look into this if you are a budding sound designer who wants to improve your workflow and save hours of time.
Wish my boss would get us off of audio blocks (not story blocks or something). It's the most amateurish crud. There are several really nice stock audio services out now, and this is one of them. But access to a Library like this has always been subscription based. What I hate is subscription based applications, specifically.