Restaurant.com Coupon for 70% Off
When I have used Restaurant.com gift certificates in the past, my total bill has been reduced by 25% to 40%. There are restrictions, however. You can only use one certificate per table. The certificates often require a minimum food tab above and beyond the $25 cert, but alcohol, tax, and tip do not contribute toward that minimum.
Caveats: Read the redemption rules before you buy and you should be fine.
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