SATURDAY, 8:40am: The Cubs rejected an offer of Oliver Perez and Luis Castillo for Zambrano, tweets SI's Jon Heyman. Zambrano has $17.83MM more remaining on his contract than they do, so I'm assuming the Mets wanted cash in the deal. Heyman says the Cubs did not want to take Castillo.
FRIDAY, 5:39pm: Carlos Zambrano told Gordon Wittenmyer of the Chicago Sun-Times that he would accept a trade if the Cubs approach him with one (Twitter link). Despite Zambrano's willingness to waive his no-trade clause, there's no reason to expect a deal. Zambrano says he wants to stay in Chicago and the Cubs don't believe they will be able to trade him this season, according to ESPN.com's Buster Olney (Twitter link).
Big Z earns $6.4MM between now and the end of the season, plus $17.9MM next year, $18MM in 2012 and possibly $19.25MM in 2013. That's a lot of money for a pitcher who just came off the restricted list and has a 5.66 ERA. The 29-year-old is walking (4.0 BB/9) and striking out (8.6 K/9) lots of batters, as usual.