You can get 50% plus discounts at restaurants through
restaurant.com
All you have to do is do a free search to see if there are any restaurants that you frequent that are part of the program. If there are, you have instant savings. It's also a good place to get a discount if you are looking to try a new restaurant in your area.
Another excellent place to get a 2 for 1 meal coupons is through your local city
Entertainment Book. They offer a wide variety of restaurant discounts and you can do a free search to see exactly what discounts they offer in your area. These coupon books are also an excellent way to save money when traveling to other cities since you know you will have to dine out. If you will be in a different city for more than a couple of days, these books will more than pay for themselves.