You're in luck! Pets on Broadway in NE Portland sells axolotls. They're grown already (7-8 inches) and the store doesn't really know the types so they sell melanoids as wild, but they're all right. They're fed sometimes on feeder fish, and I think they had some pebbles in the tank, but the ones I've gotten were healthy though they had past injuries and are a bit overcrowded. Considering the other environments I've seen axolotls sold in, they're better than most. Not the greatest, but they're pretty healthy otherwise, and right in Portland.