@Jazzed- yeah, I've seen the big blocks anywhere from $30 to $50. So that wouldn't be too bad.

@Clair Bear- Never heard of it. Is it good?
I'm sorry but I think that is kind of funny since I do know about plants. Most things are poisonious. Or they are known homes for harmful insects.

@Sadrain- Aw poor girl. Well if you don't get enough for a set I'll get you one ok?

edit: buy sets now, that is when they are the cheapest