So let's set aside our trade targets Sale and Gray and Carrasco and Quintana, and turn our attention to the FAs.@brimac: 'Dombrowski said his "guess" is, based on conversations with teams in recent weeks, that he gets his ace via free agency.'
SoxScout has been maintaining an awesome pitching spreadsheet here. Take a look.
I won't reproduce that considerable effort, but I will provide links to the B-R and Fangraphs pages for each starter, their 2016 baseball age, whether they would cost a draft pick to sign, and the Fangraphs median crowdsourced contract prediction — with the caveat that those estimates tend to undershoot reality by 10-20 percent.
Also, I've included more FA pitchers than I consider aces, but ran out of survey slots before I got to e.g. J.A. Happ. Please correct me if I've gotten any details wrong.
[BR | Fangraphs] Johnny Cueto, Age 30. No pick, 6/$132m, $22m AAV
[BR | Fangraphs] Wei-Yin Chen, Age 30. Pick, 4/$52m, $13m AAV
[BR | Fangraphs] Zack Greinke, Age 32. Pick, 6/$156m, $26m AAV
[BR | Fangraphs] Yovani Gallardo, Age 30. Pick, 4/$56m, $14m AAV
[BR | Fangraphs] Hisashi Iwakuma, Age 35. Pick, 3/$42m, $14m AAV
[BR | Fangraphs] David Price, Age 30. No pick, 7/$196, $28m AAV
[BR | Fangraphs] Jeff Samardzija, Age 31. Pick, 4/$64m, $16m AAV
[BR | Fangraphs] Jordan Zimmermann, Age 30. Pick, 6/$126m, $21m AAV