No discounts here: Coupon site GroupOn has been in talks with banks about an IPO that could put its market value at as much as $25 billion. It was valued at $1.3 billion last April, and it turned down a $6 billion offer from Google in December. In just the past three months, GroupOn’s subscriber base has doubled. The two-year-old company’s IPO is expected this year and will almost certainly be valued at more than $15 billion—the price that Goldman Sachs and Morgan Stanley assign the company.
