Bob, they're Eon plant markers, but I see Eon doesn't sell them any more. Their exclusive distributor is:
http://www.metalgardenmarkers.... However, every once in a while Mamajack has a co-op on them. Maybe ask her when she's having another one. (I need some more too.) Then I have a Brother label maker for printing the labels. I like them because the top of the markers tip slightly back so you can read them standing up.