Restaurant.com Gift Certificates
If you haven't checked out restaurant.com yet, you need to. They offer gift certificates to local restaurants at discounted prices. The inventory changes periodically, and so do the prices. Several times a year they will offer $25 vouchers for only $2! I have snagged a few of those over the years. Make sure you subscribe to their site to find out when they are going to have those deals.
As with any type of deal make sure you check the fine print on your voucher, how your savings will be deducted. Please don't forget to tip your server based on the original amount before the gift certificate was applied.