Where to get trim nuts

I am looking for the little sheetmetal (tin) nuts that hold the "DODGE" letters on hood of my 67 Dart. I know I saw them in a hardware store someplace and can't remember which one I saw them at. Found some in the HELP section of auto parts but there is only three in the size I need and I hate to spend $20($5 a package)to get 10 of em.
Thanks
Aaron