Who should i trade for prince feilder?

You could offer Kotchman and Ortiz. Lowell can be thrown in a combination but there are other 3rd base at Lowell's level. Not much vallue for Sheff either right now until he gets himself straightened out, good or bad. You also could offer Pence and Kotchman since he may think he is getting one over on you since Pence is struggling right now.