Ok, I called up there at Aquarium Center. They have Riccia only in small quantities and they sell it on a rock. They also need to find out if they're allowed to mail it to California. So I guess you would have to transplant it to your rocks somehow. He said it was $7-10 per rock with the Riccia on it.
If you call tomorrow morning around 10am Eastern (7am), ask for Gloria.
