Tijuana Flats: Buy One Entree Get One FREE – Tomorrow Aug 25th This post may contain affiliate links. Please see the full disclosure policy here. Posted on August 24, 2011 Written by Mary Leave a Comment Yay!! Tijuana Flats is offering another coupon for Buy One Entree Get One FREE! Valid tomorrow, Aug 25 only. One coupon per person. Click on the coupon above to make it bigger, and then print it and bring with you tomorrow.