Heh on the chat the other day myself and others were discussing the crabs which inhabit/raid nep pitchers and how cool would it be to have them together. On Kingsnake there is now a seller with the Geosesarma sp. terrestrial crabs from malaysia. Seller is in Cali!
If you're interested in doing an N. ampullaria & crab setup this would be the time to jump on it. I'm considering it since they are exclusively carnivores unlike hermits and I can do a planted setup with them.