While you are on the site, in your browser find and click "Add to Home Screen" A CGN beaver app icon will then be created to your phone that is directly link to the site.
Note: This feature may not be available in some browsers.
Brofasco, Fastenall, Bolt and nut supply. If you google it I am sure you will find a company that sells online. They are a standard size in industry, you just might not find them at Can Tire or Home Depot.
I found a big selection of small hardware of this sort in a local electronics parts store that caters to hobbyists and the local TV repair folks. Seems that it's far easier to get metric stuff than the other way around in these sizes. It was cheap too, provided you don't mind them being shiney and plated.
If you only need a couple or three I've got 3mm x 14mm and 8mm. PM me an address and I'll mail a few to you. They are shiney nickel plated round head phillips. Hardly the sort of thing you want on a gun perhaps but if they work it'll get you by. It doesn't say the thread pitch on the pack but it looks pretty fine to my eyes.
M3 is common size in electronics. Quantity is the problem with most fastener suppliers.
Hobby stores are a good bet too. You know how long it needs to be, head type, and pitch?