Best place to find hardware?

[Isaiah92260]

Hey everyone, I just replace the door check on the drivers side door. But unfortunately didn’t realize I’m missing one screw that wasn’t already there.
I could go to Home Depot or a hardware store, but I usually don’t have luck finding the right screws for the truck anywhere I go near me.

Does anyone know where I could get the #3 tip screw for the door check bracket?

Also I don’t know why the surrounding metal it’s all bent like that, no wonder the old one didn’t work...