they're a catfish, so don't bother looking under knifefish info. They're not all that readily available, but any decent LFS should be able to get them for you, as the distributors almost always have them on their lists. As for price, it varies widely depending on where they were collected, size, color, and time of year. My little Ompok was $12.99 at about 4", and we have a Wallago at work now that's $39.99--he's 14" or so.