From a local vendor, High Strength Bolt, in Kent Washington. As the name implies, Bolts are what they sell and they have a huge selection.
Perhaps you can find a vendor in your area, similar to High Strength, in the yellow pages.
253-872-7905 is the phone number if you want to call them. They will ship orders to out of state customers, if you can not find a local vendor.
And they do stock the stainless steel allen cap screws in metric as well as standard threads.
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