In 2016, Washingtonians saved more than 23 million coupons—totaling more than $31 million in savings, according to Coupons.com.

The new big thing in online shopping seems to be these collective trigger coupon web sites that are popping up all over the place. The largest player in this category is probably Groupon.com, which offers shoppers in 17 cities a daily, emailed deep discount offer that only kicks in if enough people sign up to use it. For example, a recent “groupon” offered a spa treatment that normally costs $120 at a local salon…