Group coupon website Groupon.com rejected Google’s $6 billion offer because they wanted a $1 billion break-up fee in case the deal did not get approved by regulators. Now Groupon is said to be preparing an initial public offering which would potentially give them a valuation of $15 billion or more. Groupon recently raised $950 million in funding and now they are talking with banks this week. This past December Groupon hired Jason Child as the CFO, who previously was the VP of finance for Amazon.com’s international business. Groupon now has about 3,100 staff members.