Robin, I'm sure you've already found the right metal plant markers for you, but I just saw this and decided to throw in my latest find. I've been having trouble finding the ones I like, and I ordered some from A.M. Leonard -- but they confirmed my order but have still not shipped to date. But I found these on Gardener's Supply and they are shipping right now.
https://www.gardeners.com/buy/...
However, I see they currently list only one pk in stock... Anyway, I have used these for years with my Brother labels -- and they're fantastic.