Buffett’s company Berkshire Hathaway acquired Dexter Shoes in 1993 for about US$ 433 million in 1993, paying in Berkshire stock rather than cash.
Because he paid with Berkshire stock (which increased greatly in value afterward), the opportunity cost was huge. One article places the “what-it-would-be-worth” figure in the ~US$ 17.8 billion range by 2025.