Tres Amigos is excellent if you're going there for tacos.
On sunday evenings, they have a taco special, where each taco only costs 79 cents, provided you also buy a drink. (If you're really tight on money, you can get a can of sprite)
I've been there a number of times, both for their a la Carte, as well as for their Taco special.
Their nachos were decent, but not so different from the Doritos you can buy from the convenience store.
Their ribs were rather expensive for the amount of food.
Their tacos, however, are the perfect, cheap casual dinner with friends and family.
(On average I spend 15 dollars for over 12 tacos)