You know the drill:  Restaurant.com vouchers never expire; if a restaurant closes or leaves the program the voucher is automatically returned to your account and available as a blank certificate, you can choose from thousands of restaurants across the country, which makes for some great choices when you travel and customer service will quickly (at no charge) change a voucher from one restaurant to another if you change your mind.  The best discounts appear near the end of the month, but that’s also when most of the restaurants have already run out of vouchers – so it’s a toss-up.