So I thought I'd share this post U-19 success story. I'm doing a ranger life for the first time, which means a lot of new melee weapons. So yesterday, fressh off hitting level 5, I decided to go back and do an elite catacombs run, and started hitting ghosts for the first time. Having not played a melee on eilte in... ever, I realized I had a bit of a problem and went looking for a solution.
So I went on the auction house, typed "ghostbane" and started looking, then changed the level filter to only show 1-5... no items.
Anyway long story short I went to the crafting hall and made my self and oldschool ghost-touch of undeadbane and got on with my life. Ghostbane was so helpful!
tl:dr - ghostbane at 1-5 doesn't seem to exist.