^depends on the light I guess, but yes, the java fern grows when everything else doesn't.
I actually have two really good LFS near me so I don't get much online. But if I did have to get plants from the net, it would be here http://substratesource.com/
The nearest store that knows what they are doing is an hour and a half away so it isn't always that economical.

. To the right of that is a plant I can't remember the name of, and then another half of a java fern mat.