Todd Walker doesn't believe the Cubs should be in a selling mode, but that doesn't mean that the club won't be. "I don't think it's a seller's market now, no way,'' he said. "You see how the rest of this month goes. I don't think you go out selling people because then you're quitting right now. And now is not the time.'' For a player to be eligible for a postseason roster, he must be acquired by that team before Sept.1. General manager Jim Hendry hasn't gotten any calls so far about any such deals. If the Cubs have a bad week, though, Hendry probably will be contacted next week if clubs have interest in trading for players who don't figure in next year's plans. Besides Walker, Todd Hollandsworth and Jeromy Burnitz could be bats that other teams would want. Jerry Hairston's versatility might make him intriguing to a team looking to bolster its bench. But in Walker's case, the Cubs have an option to bring him back next year for $2.5 million. That's reasonable money, even if Walker's defense is being questioned internally. It could sway the Cubs to keep him unless they get a really good trade offer.