Restaurant.com offers $25 gift certificates for $10. If you register with "The Coupon Mom" -
Grocery Coupons, Coupons, Free Samples, Online Coupons, Restaurant Coupons you get special codes by e-mail that allow you to purchase them for 60% off or more - same certificate costs only $4! Search by zip code and radius from your address. You can print them from your computer or have them mailed to you. I've bought certificates as birthday & anniversary gifts for relatives this way.
Restaurant.com - Deals on neighborhood restaurants. $25 Restaurant Certificates for only $10!