If using homemade corn tortillas, cook the tortillas close to serving time so that they are still warm. If using commercial tortillas, wrap them in foil packets, about four per packet and heat in a warm oven.
Assemble meat, cheese, and other ingredients in small bowls to allow diners to assemble their own tacos.
Price match. I track my prices so that I know the best prices on the items we use the most. That means I buy my cheese and lettuce at Costco because they're super cheap there; my beef at Ralphs or ALDI on sale, etc.