Where to purchase sushi-grade ahi tuna in Arizona? (or purchase online overnight shipping) I was looking around and I couldn't find any good options for buying ahi tuna for sushi/sashimi in Arizona and was wondering if someone could point me in the right direction.

I've also tried online at Honolulu Fishing Market, Seattle Fish Company and Catalina. No luck here.

BONUS: If I go to Costco or the like is the fish here also acceptable for sushi/sashimi/nigiri?
If you mean sushi grade ahi tuna, you can’t buy it or consume it fresh, because of parasites in the flesh. All sushi grade fish is held frozen at 0°F for at least forty eight hours to kill the parasites.

If you don’t have a local source for sushi grade tuna, you can find a variety of reliable shippers on-line, although they can be a bit pricey.