I got a sushi-making kit as a gift a few years ago, and have yet to bust it out. I would love to try it, though. I figure I could have some friends over and make California rolls (not my favorite, but usually well-received) and spicy tuna rolls, but can I just use the tuna from the Publix seafood department and serve it raw? Is it fresh enough, and safe? If not, is there a place that a normal person can get ahi-grade tuna? (I live in Casselberry, but can pretty much go anywhere around Orlando.) How much should I expect to pay for such tuna?