I know that Groupon needs absolutely no introduction. The website that offers a range of holidays, goods and experiences at amazing low value prices is one of the phenomenon’s of modern times. You can try a new restaurant, book a spa date or do a bit of Christmas shopping on Groupon, and be absolutely sure to make a substantial saving. And now Groupon USA is taking it that one step further by also introducing Groupon Coupons, ensuring that you can make further savings from a range of stores and services. The idea is that you can make savings, in the form of discounts, free postage and packaging and end of…