Suppose that's not any more expensive than frag racks. I like sticking zoa frags in them. Give them enough time you have an interesting shaped rock of how ever many varieties of zoa you added.
They ship everything with the priority flat rate boxes via USPS, so it'll come in quickly as well. The Large cluster is $12. Hope that helps, I haven't seen any locally.
Liquid Kingdom has a couple, a small one with maybe 3 barnacles and a little bit bigger one maybe softball size or bigger - don't know how much they are and the big one has some aptasia, but a couple peppermint shrimp or aptasia-x could clear it up.