This is Italian Vallisneria also known as Italian Val. The price is for one rooted plant grown submersed. This is an easy to grow grass like plant for the back of your tank. They can grow tall or short depending on if you trim the leaves.
This is salvinia minima. I love this plant as it grows the little bumps ont he leaves. It grew huge when I had it in my tubs outside which is why I think it is a great plant for that and allowing the fry to hide. It is easy to grow as long as there is not too much flow in the tank. You will get a large handful of these plants which is roughly 10-20 plants.