Their value is relative to the talent pool. The RB pool is full of guys but only a few will consistently produce and be given an opportunity. You'd be hard pressed to make a straight up trade.
However, since you are 0-9 and have no shot at making the playoffs you should still try. I've been in your spot and what I like to do is go after players that are having awful years or better yet, injured. A perfect target would be MJD. He probably has a lisfranc injury and is a holdout threat for next year. His owner is a perfect target right now.
12 Team Keeper (1 per position). Start two per forward position, 3 D, 1 Goalie, 1 Util
G=1.5, A=1, PPP/SHP=0.5, W=2, SO=3
RW-Ryan (lw), Purcell (lw), Parenteau, Iginla
D-Karlsson, Streit, OEL, Burns, Salo
Rookie- Galchenyuk, Granlund