Hurdle, do you live close to Jackson? If so, try and see if B&C Aquarium is still open. They carried a few different varities of piranhas...I saw one-eyed ones in there a few times. That's a good 'Mom & Pop' store that has a lot of really nice fish. I haven't been in there in years, and I remember hearing 'Pop' talk about closing the place, so it might not be there anymore.
They've got kind of a weird law here in SC about piranhas, they are legal to own but not legal to sell and you can't have a male and a female in your possesion at the same time. I'd kind of like a couple, but I'm sorta scared of them too. I know I'd forget myself and stick my hand in the water at some point.