Reyna Foods offers a respectable selection of Mexican (as well as some Latin American) grocery goods.
I'm no expert on these genres of food, but I must say that the variety of hot sauces available is impressive to me! A lot of the sauces come in decorative or comical jars, making for perfect little gifts for the hot sauce lover in your life. (Everyone knows a hot sauce fanatic or two, right?)
The tortillas are really good and fresh, and I love that this place occasionally sells bagged Pittsburgh black and gold tortilla chips!
Always seems to be a nice selection of small and large piñatas here as well. There are a lot of character piñatas like "Dora the Explorer" and "Finding Nemo" though--kind of weird/creepy, but whatever!
Reyna Foods is worth a stop for sure, even if you're not particularly into Mexican or Latin American food. Nice people and fun things to look at.