Not a fish, but a lfs near my area has a clay pot, that is broken in half, in one of their aquariums. They are selling it for 3 or $3.99(Can't remember the price for sure). The edge where it was broke is not sanded smooth or anything. You can buy a whole clay pot of the same size for less than that. I've wondered if it is a joke, but I doubt it.
They do seem to have the best variety of rarer sw and fw fish in my area. I'm not sure about their fish prices, because I haven't seen many of their fish at other lfs. Their albino bichirs for 14.99 don't seem like a bad deal though.