I live real close to the Pacific Rust Generator, they are indispensable for that one reason. I’m not bolting high strength machinery together, but fittings to the house, Or replacing rusty license plate fasteners.SS is nice because it doesn't rust, other than that it's a crappy material for fasteners.
You need to get more of an idea of what fasteners you need....
Maybe something like 1/4” diameter bolts in various lengths like 1/2”, 1”, 2”, 4”, and 6” along with the nuts of the same thread. And maybe a few different washers, all with the same 1/4” opening but some washers are 1” diameter, some are 2” diameter and maybe 4” diameter washers.
Repeat this with maybe 1/8” and 1/2” diameter bolts, with sets of nuts and washers for each. And then something similar for machine screws and wood screws and drywall and concrete screws with different lengths...

I have used these guys as well and have nothing bad to say about them.BoltsAndNuts.com has kits with storage and everything, for example:
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Inch 18-8 Stainless Hex Cap Screws, Hex Nuts, Flat & Lock Washers - 2012 PCS
Shop High Quality Fasteners Hardware Assortment Kits at BoltsandNuts.com. 18-8 Stainless Coarse Thread Hex Head Cap Screws Bolts, Nuts, Flat & Lock Washers Assortment Kit with Large 40 Hole Compartment Storage Binwww.boltsandnuts.com
I have used BoltDepot.com. Also no complaints whatsoever.I have used these guys as well and have nothing bad to say about them.
Sounds pretty much like my purchases. I've added acorn nuts, fender washers, and truss head screws where I have a need for low profile.You need to get more of an idea of what fasteners you need.
Try flathead and panhead machine screws in 6-32, 8-32, 10-24 and 1/4-20 in lengths that seem appropriate, perhaps: 1/2, 3/4, 1, 1-1/4, 1-1/2. You might get some extra long that can be cut down.
Do the same with flathead and panhead sheet metal screws in #6, 8, 10, 14.
Maybe hex head machine screws in larger sizes.
Flat and lock washers, plus hex nuts to fit above.
Then #8 drywall screws in 3/4, 1, 1-1/4, 1-1/2, 2, 2-1/2, 3. Perhaps #10 in the longer sizes.
That will be a good start.
Can you please post a link to the Amazon assortments.The nice thing about the Amazon assortments is you can spread the cost out over some time since they're smaller sets.
Just go to Amazon.com and search "stainless steel screw assortment". Scroll down for the boxed sets.
You'll find a bunch. Most of what I bought were the Vigrue or Satantech sets.
While 316 has somewhat superior corrosion resistance, it has lesser mechanical strength, is more expensive and generally harder to find. Unless the application is submerged in seawater, it is probably unnecessary. More readily available is 18-8.For Stainless i try to stick with 316