This comes from MMAPayout.com via the LA Times.

"Dallas Cowboys owner Jerry Jones has offered a $25-million guarantee to host the scheduled March 13 mega-fight between Floyd Mayweather Jr. and Manny Pacquiao in his Texas stadium, a source close to the negotiations but not authorized to speak publicly about them told The Times today.

Jones’ new Dallas Cowboys Stadium has a capacity of more than 100,000. His offer exceeds the $20-million guarantee that Staples Center offered fight promoters earlier this week.

When asked about the Dallas guarantee, Mayweather promoter Richard Schaefer of Golden Boy Promotions would neither confirm or deny its accuracy.

"The numbers are going in the right direction, and I believe we’ll end up in excess of $30 million," Schaefer said.

A spokesman for Jones declined to comment about the site talks.

The Dallas offer will be greatly challenged by the MGM Grand Garden Arena in Las Vegas, which is expected to offer ringside seats for $2,500, which is $500 more than the highest-priced seats for the most lucrative fight in boxing history, Mayweather’s split-decision triumph over Oscar De La Hoya in May 2007."