There's the option of buying
say, half a dozen, or a dozen fasteners from a vendor, & taking note of what make & lot number they are from. And then having some testing done on them in order to determine their quality.
Then, if they're up to snuff, go back to the store & buy several full boxes from the same maker & lot number.
That way you've got a much better than average chance of getting the good stuff.
And in this scenario, I'm referring primarily to stainless fasteners. But you can do the same wth Bronze ones, or anything else.
PS: The buying
them in bulk thing, can help with their price
. Especially if you're buying several sizes, & a good quantity of fasteners, all from the same vendor.
It's just common sense, but as Thomas Paine, one of the Founding Fathers said, "Commmon Sense Isn't So Common".