Robertson isn't having a bad year for the White Sox so I don't believe they are going to have to take on much of his salary. The White Sox are going to demand Brinson+ for Robertson. I don't think that is worth it even with the White Sox taking on half of his salary for this year and next. I don't believe the White Sox are going to pay any of Robertson's salary at all and by the deadline they will get a nice haul for Robertson. I would rather go after someone that is not going to take a big time prospect to acquire someone like Jeffress or even K-Rod would do the trick. For targets that I think might not take a lot to get would be Brad Hand (Padres), Juan Nicasio (Pirates), Jeffress (Rangers), K-Rod (Tigers), Jason Motte (Braves), and Jim Johnson (Braves). Johnson maybe the only one in that group that may cost a little bit more due to the "closer" effect.