Possibly some of these items are available in Panama city but in Boquete and David I have been unable to find:
“O” ring kits
Snap ring kits
Plumber’s putty
Silicone grease
Pex plumbing tools and fittings
Star drive wood screws and driver bits
Sta-con electrical connectors
These items are available through Amazon although you will pay about $3.00/pound for shipping through Miami.
My list is by no means inclusive. There are many other items that are unavailable here.