You might combine that with your current tagline to make this: "Offline Ads Made Easy." You still need to imply that you're letting people buy something or making the buying process simpler.

If you settle on a tagline you might think about using some imagery that represents what you do -- college newspapers, billboards, restaurant menus, etc.

A picture may not be worth a thousand words but it can usually replace a paragraph . . .

Thanks Gavin... great advice.