Making your own version of a sorting tray has the obvious benefit of allowing personal variations tailored to your unique requirements. However, if you don't have the time or inclination to build your own, allow me to recommend a pill counting tray as used by your local pharmacist when filling your prescription.

Amazon sells such...

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

I bought one as a companion to the ones I've already built. It works well but now I have so many sorting trays, I face the task of making a sorting tray to sort my sorting trays.