50PoundHead
Hessmania Forever
I have doubts that Boston sells when they are 2-3 games back of the last WC. But if they do Nick Pivetta is someone that would be useful either out of the pen or as spot starter. He's been pretty dominant out of the pen.
It may not be that exciting of a deadline seeing all of the teams within striking distance of the last wild card slot. But more buyers and fewer sellers will drive up the price on the guys who will likely be moved.