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If the Cardinals lower their expectations...

The Cardinals have hit a snag in their efforts to add Roy Oswalt to their injury weakened starting rotation. But some other options have emerged.

The Diamondbacks, who set the price of former St. Louis starter Danny Haren too high for the Redbirds to bring him back, are now set to part with another member of their rotation, Edwin Jackson.

Jackson has been remarkably inconsistent this season. He threw a no hitter earlier this season. But his overall ERA is 5.01. According to FOX, the price is high for Jackson. The Diamondbacks would "have to be overwhelmed" to let him go.

That leaves me underwhelmed.

If the Cardinals did make a deal with Arizona, maybe they could expand it to include the team's other pressing need: A middle infielder or two who can not only hit, but actually catch the ball, too.

Second baseman Kelly Johnson is attracting attention, according to Fox Sports. Arizona said a couple of weeks ago that shortstop Stephen Drew is not available.

A much cheaper option might be former Tigers starter Nate Robertson. He was released Tuesday by the Marlins after putting together a 6-8 record with a 5.47 ERA. Since the 2006 World Series, Robertson has a 24-35 record with a 5.51 ERA. He's given up an average of 146 hits in 124 innings per season over that span. But maybe pitching guru Dave Duncan could do something with him.

Jake Westbrook continues to be linked to the Cardinals in rumors. But he's about as impressive as Robertson at this point. And he'd be a heckuva lot more expensive in terms of prospects since Robertson is a free agent.