Teachers can teach a valuable lesson about saving money with this promo from Rubio’s Fresh Mexican Grill. The popular quick-service restaurant is celebrating its Teacher Appreciation Days today, Wednesday, September 9 and Thursday, September 10 by giving teachers a FREE taco — just show a valid school ID. Wait, there’s more! The teacher will also receive certificates for a FREE taco to share with his or her students. (Certificates are available while supplies last.) Free food is a sure way to be popular with students, if even for just a day. Thank you for the tip, Jacqueline!