Tomahawk steaks are available at Costco and are officially labeled 'American Wagyu.' The Tomahawk steak is simply a ribeye beef steak with at least five inches of rib bone still intact. 329. Definitely worth the investment! You can find out if the particular steak you want is called a Tomahawk by looking on the packaging or by asking one of the staff members at the counter. You can also ask them how long it will take to cook if you aren't sure what temperature to use with your meat thermometer. Costco sells their wagyu directly from Japan, so they are guaranteed to be top quality. They usually come in packs of four or five, depending on the size of the steak. It's best to buy less than you think you'll eat since they don't last forever and these steaks do go bad very quickly once they're removed from the refrigerator. The cost of the steak itself is pretty expensive - $69 for 4-5 inch ribeyes - but it does include shipping & handling which tends to make them worth it for most people. If you live in an area where there are no Costco stores, then you will need to purchase your wagyu from a reputable dealer.