I must qualify what I said by saying that I've found this much harder the more specific I need to be. I could find 0 results for short M3 screws when I searched domestic sellers a few weeks ago. No hardware- or electronic stores carried them. One had them listed with a 3 month delivery and at about $3 each. After that hour+ you Amazon it, without putting hours into finding it in other countries who's languages you don't speak.

Airsoft glasses is something I can find in any mall here.

We're pretty well of the beaten path of Amazon here, but I had a similar need (#1 slotted flat-head brass wood screws) that McMaster-Carr didn't sell a little while ago and found them on microfasteners.com. It looks like they stock metric machine screws as well.