This deal has ended.
Through 4/6, Restaurant.com takes 80% off all their dining certificates via code CHOW. This lowers the price on $10 certificates, which are normally $4, to $0.80 and $25 certificates, normally $10, to just $2. Restaurant.com always restocks its certificates at the beginning of the month, so now is an excellent time to buy. Obviously, not all restaurants participate, but there is definitely a good selection to choose from. Just be careful to read the fine print as many restaurants exclude alcoholic beverages, weekends and other things.