This deal has ended.
Restaurant.com is now taking 80% off dining certificates via code GIFT. This drops the price of a $25 gift certificate, normally $10, to $2. They have a large selection of participating restaurants nationwide, and you can search by zip code, neighborhood, and more. Be sure to read the fine print for each restaurant, because they all set their own spend thresholds and exclusions such as alcoholic beverages, weekends, or holidays.