There are some people on this site that keep r sarasinorum, but i dunno about r trachyrhynchus. Sarasinorum run about $300 for a juvenile. youre gonna have a hard time getting a trachyrhynchus though, i've heard it's really hard to find a harmonizing couple, and since they give live birth, they won't produce as many babies. But they would probably run around one or two grand per animal.
P.S. get a leachie!! they are a lot calmer than sarasinorum and a lot less expensive than trachyrhynchus!! lol... just my $.02