Restaurant.com is running a hot deal right now where you can get 80% off their gift certificates when you use the code PRESENT at the checkout. This means that you can get a $25 gift certificate for $2! Want to make the deal even sweeter? Shop through Cashbaq and get 25% back on what you pay meaning that you get 50 cents back on a $2 purchase making your $25 gift certificate cost only $1.50. Now that is some cheap food!
As always, read the fine print with each of the certificates. Many have restrictions about using them only for lunch or dinner or with a minimum purchase amount.