Get your free 2 Grilled Chicken Tacos And Premium Milk Shake. You will receive 2 free chicken soft tacos from DelTaco for signing up to there email club and you will receive there premium milk shake on your birthday. I love milkshakes so its not a bad offer t all. You will also receive special offers from them upon joining their email club but you can always opt out to do that. This restaurant is located in New Mexico and Texas. Great Tip – if you don’t live in one of these locations and are planing to visit then you can join their club 1-2 weeks prior to your vacation time.