Don't thank me. I just took @baldilocks part number and threw it into the Toyota Parts Deal site.
Some other good sites for you would be PartSouq, Amayama, MegaZip and ToyoDiy. Hope this helps.
Is this your screw? 90149-40012 Genuine Toyota Screw - https://www.toyotapartsdeal.com/oem/toyota~screw~90149-40012.html
If not, you can find pretty much any screw on the McMaster website. I've used them extensively for work.
https://www.mcmaster.com/