Where to buy joycon railing screw?

I noticed one day while I was playing handheld that my right joycon had some give to it and at first didn’t think anything of it but then I looked at the railing on the console and noticed I was missing a screw. I’ve never touched the screws before and never had to make a repair or replacement on my device. For the life of me, I cannot find where to buy a compatible screw. Any help would be much appreciated!