Small update... got my Elatine hydropiper today! Here's my review:
This is an unbelievably rare plant. I have never seen it for sale, and almost never seen it grown in someone's tank. Even though it's that rare, it's being offered for a decent price: $22 shipped for this amount. It actually came in a little plastic container, with the brand "Anubias" packaging. It came in this weird black gel that must have been nutritious. It was easy to wash off. The plant came in relatively healthy (not melting, dried out). It comes with a decent amount.
It came a little squashed/clumpy, I don't know how to describe it. And 2-4x as much as a normal pot, my butt. It was only slightly more than that. At the price some of the more common species are at (HC, glosso, etc) I'd skip it. Also, the way it was growing, the roots were super short, which made it hard to plant.
Well, I can only see how it grows from here on. I'd only buy it if you're comfortable growing your plants and would like to try something interesting. At such a decent price, it's hard to resist your curiosity.
My Golden Rule of planted tanks: WWTAD-
"What would Takashi Amano do?"
RAOK Club #69