CHICAGO (CBS) — Six billion dollars is a lot of money, but apparently not enough for Google to buy Groupon.

The long-rumored acquisition is off, according to the Chicago Tribune, which cited sources familiar with the proposal.

Chicago-based Groupon, an online coupon company, offers daily deals to its members on anything from skydiving to restaurants. And Google, of course, is a lot more than just a dominant search engine.

Now there’s talk that Groupon may go public with a stock offering.

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