Couponing has become HUGE online.  The number of websites offering coupons and discount codes has grown exponentially in the last couple years. Unfortunately, so has the amount of fake code or counterfeit printable coupon sites. too. AND, it can be tough to separate the legit sites from the lousy ones. Experts say, to spot the good ones, be sure the coupons have recent, valid dates and expiration dates. According to smartmoney.com, the best coupon site remains, coupons.com.