Groupon font here refers to the font used in the logo of Groupon, which is a deal-of-the-day website that features discounted gift certificates usable at local companies.
The font used for the Groupon logo is probably ITC Avant Garde Gothic Bold originally designed by Herb Lubalin. The font is a commercial one and you can view more details about it here.
Download Avant Garde Gothic Font
The Avant Garde Gothic font identified above is not available for free, please follow the link above and purchase the font. Meanwhile, you can take a look at our collection of fonts for cars, pop music and apparel as well as round-ups of new & fresh fonts around the web.