These Chalkboard Signs from sierrametaldesign are really cute. They come in a set of 15 for $65.
I really like this Vintage Silverware Garden Marker from WoodenHive and it is only $7.00
This is a custom set of 8 wood garden sticks for $12.00 from Shanesbirdhouses. Also cute. I'm having a hard time making up my mind!
I know this isn't a garden marker, but I liked it so much, I included it in this post. It could go in the garden or the kitchen! This vintage rustic hand painted wood herb sign is by kspeddler for $75.