did anyone see the episode of the simpsons where homer buys a lobster to cook? The big ones were too expensive so he buys a little one and decides to keep it while he fattens it up. THen he gets attached to it and it becomes a family pet, pinchy!
haha sorry I don't have any real advice, that's just the first thing that came into my head.
actually though, you should check out your lfs because ours has some really neat freshwater lobsters (some are bright blue), I think they are crawdads but it would probably be a lot easier.