Haha I get the sounds part. I always leave it as one of the last parts to do in my games too, but it's such a crucial thing for game feel and polish. It's an underrated part of game dev that's not noticed until it's missing.
For free sounds, you can try checking out freesound.org, opengameart.org, or soniss.com. The catch is that it might be unorganized and you have to wade through a lot of it yourself to try and find a good sound for each part of the game.
If you have the means, then you can try checking out ovanisound.com, which I used in my own entry. Might seem expensive on their website, but I have only bought stuffs there when they go on sale from HumbleBundle or on their website, which is usually like $20 for a lot of packs. So it's good enough of a value proposition for me to pay.
Hope it helps!