Is Google buying Groupon? For billions ? The rumor mill is going crazy . And it might be for 5 or 6 billion ! As a comparison, Yahoo! is worth about $21 billion, but that includes over $3 billion in cash AND equity investments in Yahoo! Japan + Alibaba that are likely worth close to $10 billion. In other words, Google might be offering to buy Groupon for 75% of the value of Yahoo! )excluding their cash on hands & foreign investments(.