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You can order them on-line or call your LFS and have them order them for you. They can tell you what the price will be. By checking on-line you can also get an idea of the price. I would go to the LFS.
I've been seeing them come up frequently on aquabid. Sometimes they're under the killifish section, sometimes under the native fish section. Pricing has been very reasonable . I'm eyeballing them too for my native tank