If you have a particular restaurant that you like try to check out their Web sites and sign up for their regular email newsletters ,you will receive coupons and special offers.
When it comes to saving money on restaurants my advice is :" Order water instead of sodas,milk or other beverages". At least you will be saving $2.50 or even more.
Avoid eating on restaurants at dinner time , usually prices goes up at this time.
You can buy discounted gift certificates at http://www.restaurant.com/. or check your city's local newspapers for local coupon sections. . Websites as OpenTable.com and MenuPages.com post their menus from many restaurants around the world.
Make an appetizer your meal. Appetizers’ portions are often very good portion for 2 people ,or consider buying one meal and appetizer instead of 2 whole meals.