I am using a great source for camera fasteners tiny and bigger on eBay

I recently needed 2.5mm x 0.7 pitch for an old camera

Hard to measure that size, so I got it wrong first go, ordered 3mm, kept them for next time

They deliver quickly by USPS letter, total with shipping $6

I used to waste money and gas going to stores...

https://www.ebay.com/usr/monsterbolts