Groupons and other online social coupons are great way of saving money, but they cost the business tremendously. When you pay $25 for a Groupon that gives you a $50 value, the merchant gets around $12.50. If you just mention the Groupon without buying it, you could get a similar deal.
Instead of buying online, try going directly to the merchant and ask them for a similar deal (you might have to check in with the manager). Savvy business owners realize if they say no, you’ll just buy they coupon online and they’ll get less money.