You should be able to buy it at Whole Foods, but I usually get it at Wild Fork Foods. Their tuna steaks are consistently excellent. They have no fishy smell when you open the package and when you cook them. They're typically huge - around 1 pound each, so I use just one for two people. They come frozen, so you'll need to defrost them completely in the fridge before cooking them. I typically place them in the fridge the day before I cook them, in the morning. By evening the next day, they are thawed.