Tresierra Market is a local Mexican market.  The wonderful thing about Tresierra Market is the freshness of their food, and their great prices (look for their weekly specials online).  If you are looking for well priced ingredients like tomatoes, onions, avocados, oranges, mangoes, and other fruits and veggies, this is your place.  They have a variety of seasonal fruits like papaya, pineapple, peaches, berries, and more.  They also have some more exotic offerings, like cactus.  Probably one of the best parts of Tresierra Market is their meat counter, which has lots of fresh meats for a great price, and all different cuts.  If you are looking for a pork shoulder for your carnitas, this is your place.  Also try their many fresh Mexican cheeses, salsas, and pastries.  You can also take some prepared foods home, like enchiladas, chicken, and tamales.  If you are looking to get ingredients for an authentic Mexican meal, look no further.