Bunches are a couple dollars apiece and are usually three to four rhizomes directly from the nursery. If you can wait a little while I've got a load of ferns growing in a display that is being taken down in a few weeks that you're welcome to buy from too. I've got to buy the plants myself to get the wholesale cost rather than them being my own plants. I'll let you know what they cost on/after Friday.
Best,
Phil