This deal has ended.
Through 3/16, Restaurant.com takes 80% off all their dining certificates via code BITE. This means that $10 certificates, which normally sell on Restaurant.com for $4 are now just $0.80 and $25 certificates, normally $10 are just $2. 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.