bdank,
Yes, they are galvanized and have not rusted in 4 years that I have had them outside on the EarthTainers. The darn things cost more than $1.00 at Home Depot. If you need just a few, Lowes is best at $0.47 each.
The online source I referenced in the Guide with a price of $0.16 each in 100 qty. is obviously the best deal. I have now ordered from them a total of 5 times without a problem. Seem really reliable and honest.
Raybo