It's tough to say right now as we don't know who exactly is going to be selling still (thanks playoff expansion). But outside of the top names, I don't know where the idea of these middle of the rotation arms are going to be too expensive. That's just not the case anymore for rentals.Who do you think they should target? I'm not thrilled with most of the names I've heard and they even sound expensive.
Edit: The Cubs need innings just as much as they need upside in the rotation. Guys like Boyd, Horton, and Brown are all coming up on or have passed innings thresholds from recent seasons.