Restaurant.com: 80% off Summer Clearance Sale CodeSeptember 5, 2011 by Mitchell Wischmann This post may contain a link to an affiliate. See my disclosure policy for more information. Restaurant.com has released a new coupon code! Through September 7th, you can use code RDCSALE at checkout to get 80% off most Restaurant.com certificates. This makes a $25 certificate only $2! Great deal for eating out!