A few days ago firejerrymanuel made a very nice post about players who could be available for cheap via trade.
I'm just adding to the names:
George Kottaras - Pretty much worthless to the Red Sox and in trade value as well. Kottaras could have been a long term starting Catcher for the Red Sox in the worst case scenario where they didn't get Martinez and V-tek didn't come back. Kottaras, 27 next year, is a disciplined hitter who could compete for at least a platoon job at catcher. He costs all but no money to a major league club, and he has solid MiLB numbers so it shouldn't hurt to give him a shot. Spent the rest of this year recovering from a minor lower back injury.
Sean Marshall - Pretty much always available every off-season, Marshall is at the very least a serviceable lefty reliever. He has a solid fastball-curveball and has been at the fringe of the Chicago rotation every year. 27 next year as well, Marshall would be an interesting low-risk high-reward bargain. So far in 2009, Marshall has seen 44 appearances, 9 of them starts. He's pitched 74.2 innings, striking out 56, walking 30, with a 4.70 ERA. In previous years his ERA has been 3.92 and 3.86. Injury is a bit of trouble, but at most he'd be making $2.5 million after avoiding arbitration and would be good for the bullpen and/or 5 spot in the rotation.
Jonny Gomes - I'm not sure if he's a free agent after this year, but damn it he is a nice bat. Say what you want about his outfielding skills (Because they are HORRIBLE) but his power is phenomenal and he's disciplined, and maybe a move to first base would be beneficial to his uncanny ability to suck. Or you can always put his ass in AAA. Gomes is certainly making a case for himself at the plate with the Reds -- he has 15 homers in 188 at-bats -- but his bat seems to be underappreciated.
Luke Hochevar - Luke is actually an extremely undervalued pitcher in terms of performance. A casual baseball fan would shudder at wanting his 5.51 ERA on his/her favorite ballclub, but I'd welcome Hochevar with open arms. Hochevar's FIP numbers aren't incredible, but actually rather encouraging: in 2008 it was 4.43, and in 2009 it's 4.64. By no means are these numbers spectacular, but they are comparable (kind of) to Oliver Perez's 2007 and 2008: 4.35 and 4.68, and Hochevar's tRA is actually better. What we could be getting is a cheaper, less erratic Oliver Perez. What we'd trade? Knowing the Royals, the cost could be as low as Sean Green!
Mike Napoli - This is a huge stretch, but I'm sure for the right package, Napoli could be had. And Napoli is an all-star caliber player.