Two weeks back, all five teams in the National League West considered themselves buyers.

Not now.

Officials who have spoken to the Giants say their recent slide has led them to put any buying on hold. While they haven't yet switched into sell mode, they could well be heading in that direction. And while there's no guarantee they would move either one, both Tim Lincecum and Hunter Pence can be free agents at the end of the season, and would be attractive (if expensive) pieces.

The Rockies, meanwhile, are now on the buy/sell fence. This weekend's four-game series against the Dodgers could tip them one way or the other, either to pushing harder to acquire a starting pitcher or to a limited sell-off.

Even if they do sell, sources say, shortstop Troy Tulowitzki and Carlos Gonzalez would be off-limits in trade talks. The Rockies would likely listen on All-Star Michael Cuddyer, but the word is they would need to be overwhelmed to even consider moving him.

The Rockies begin play Wednesday 4 1/2 games behind the first-place Diamondbacks, and two games behind the second-place Dodgers. They've lost 16 of 24 since Tulowitzki went on the disabled list.

The Rockies had been aggressive in their search for starting pitching, making a two-player offer for Ricky Nolasco that was said to be stronger than what the Dodgers paid for the Marlins right-hander. The difference was that the Dodgers were willing to take on the remainder of Nolasco's contract, while the Rockies wanted the Marlins to pay some of it.