So here's a quick list of OF capable trade targets who could MAYBE be reasonably available and worth looking at.
Curtis Granderson (15M, plus hitter, probably average defensively, probably cost a good prospect or more in trade. Projected at 1.4 WAR, but I'd take the over on that.)
Howie Kendrick (10M, great versatility, above average outfielder defensively. Projected at 1.4 WAR, but likely higher as a full time outfielder. Potentially excellent trade target.)
Andrew McCutchen (14M, best remaining known available bat by far. Price probably too high to acquire him. Projected at 3.4 WAR).
Billy Hamilton (ARB, incredible defense and SB, walk rate is increasing. Price likely to be high. Projected at 1.5 WAR, but that's probably just about his worst case floor. Can anyone say 2 man outfield?)
Andre Ethier (17.5M. Unclear how available he is, but rumors seem to suggest Dodgers could look to trade him or Puig. They'd have to eat some money. Hits for average, some pop, average defensively. Basically Reddick, but a few years older.
Yasiel Puig (8.214M. Unclear how available he is, rumors are there though. Huge potential, projected at 3 WAR, potential makeup issues, probably costly to trade for).
Charlie Blackmon (ARB. Probably a league average player, although has some upside beyond that. Hits lefties and righties well. Trade cost high).
Carlos Gonzalez (20M, good power, significant home/road splits. May only be average away from Coors. Rockies would have to eat money)
Melky Cabrera (15M, horrible defense, decent bat, very low k rate. Projected at 1 WAR. When he's good, he's probably worth the salary. When he's bad, ouch.
Jarrod Dyson (ARB, great defense, great speed. Gets on base enough to use his wheels, low strikeouts. Excellent trade target.)
Seth Smith (7M, well above average bat if you keep him away from lefties. Defense last year might be smaller sample size or a bigger problem)
Other probably not so good options:
Jay Bruce (Decent but not great bat, defense probably gives back all the value, did not perform well after leaving Cincy.)
Ryan Rua (Rangers will probably keep him as 1B and Choo insurance this year. May or may not suck anyway).
Tommy Pham (Likely roughly average offensively and defensively, Cards may not have room to carry him).
Jordan Patterson (Rockies may look to trade Cargo or Blackmon and keep Patterson, but picking up Desmond makes him potentially expendable. Always managed to hit a bit, improved walk rate last year)
Feel free to add other guys.