I just bought a $25 Gift Cert to a local restaurant my family frequents. The cost for the certificate was $4.
The catch is you have to dine after 4pm, you have to spend $35 or more, and 18% gratuity on the entire bill is required. Note that the terms seem to vary by restaurant and certificate amount.
I haven't tried to redeem yet, but I am not expecting any issue as from the "select" restaurants participating in my area there is obviously some affiliation and kickback going on.
So, the next time we go to that restaurant we walk in saving $21.
TJR