Thusly "dfreas" Spake Unto All:

I'm
not sure I've ever seen them for sale in any of the LFSs around here
though.

No, not that species, although there's probably similar species in
streams and lakes around where you live. Bigger species like /Neritina
natalensis/ aren't that uncommon at LFS's, and are outstanding
algae-eaters.

You'll get a kick out of this one:

http://mikes-machine.mine.nu/specime...d_Dscn8485.jpg
An aquatic slime mold. Possibly the most bizarre creature I've ever
kept. It's usually crawling around on the glass.

Where can I get one!? Heh, congrats on getting that in your tank. I'd
love to see something like that working its way across the glass one
day.

I often take in sunken wood, leaf litter, plants etc from local
waters, precisely to get interesting inverts. I'm pretty sure the
slime mold came from a piece of sunken wood from a local bog.
The tank it's in has a pH of 4.5, has peat-and-oakleaf substrate. It's
quite interesting to see how different the invert fauna is in that
tank compared to the high-pH tanks. There's *no* crustaceans or snails
in the "bog" tank, instead there's nematodes, protozoans and fungi.
And this critter.