Four-for-$1 Mini Tacos joins 7-Eleven’s food line-up, appealing to the growing number of round-the-clock snackers. 7-Eleven Inc. will spice up its hot foods menu with the addition of Mini Tacos, a tasty south-of-the-border treat for hungry consumers looking for a quick, hot snack. Suggested retail price is just $1 for four Spicy Beef Mini Tacos,…