Costco is a big place, and there's a lot of food there. It has a particularly vibrant selection of Mexican foods, which go way beyond the classics that you'd expect to find in other stores — and a lot of them are pretty darn good. Sure, Costco stocks salsa and guacamole just like every other retailer, but it goes one step beyond that. Its prepared foods selection also has some delicious Mexican options, with its street tacos a real winner for dinner. Don't miss these essential Mexican foods next time you're shopping at Costco.