I had a butcher at a local grocery store, HEB show me a tri tip when I was looking for a steak to grill a few months back. They come in about a 2 lb piece and sell for about 10 bucks (much cheaper than a prime ribeye). I cooked them indirect with a piece of smoke wood to about 140deg internal and then sear a few mins on each side to finish. It makes a very tender piece of beef. If you can find one I would suggest giving them a try.