Warren Buffett tells CNBC that when it comes to possible acquisitions, there aren't many "elephants" out there and not all of them want to be in the Berkshire Hathaway "zoo." Appearing live from Omaha on CNBC's Squawk Box this morning, Buffett tells Becky Quick he doesn't have any "high probability" deals in the works now. While he's not necessarily scared away by higher stock prices, they do make it harder to find a deal now than two years ago.