"Big Ass Burritos"....Beans & rice are a cheap filler and you already have them...meat of some sort...what ever you are long on....salsa & cheese in a 14" tortilla.
Do you have a char broiler? You could do chicken thighs.....
marinate in cilantro, lime, garlic, olive oil, chili flakes, s&p great marinade for simple grilled chicken. Tortillas are spendy though...about .30 ea.
"Grilled steak" soft tacos... I just used up some roast beef I had in the fridge for this tonight... cooked a bit of chorizo and onion, added the very thin sliced beef and a bit of hot sauce, tossed just until it was hot.
Great flavor and moist, unlike the tacos I got from a truck in Yakima today. The only thing they had going for them was the made to order tortillas.
Can you get #2 fryers?.... split them, serve a 1/2 chicken, cost you a buck and has good perceived value....
citrus marinade similar to El Pollo Loco, charbroiled, beans & rice on the side w/ a tortilla.
As Mar suggested.... Tostadas, thats a cheap, quick staple for me.
Shredded thigh meat w/ a bit of your enchi sauce to moisten, refried beans, cheese, lettuce, salsa & sour cream.
Flautas.... Puffy Tacos