I sold my stocker for $400. That was with 10k on a rebuild with a 360 thrust bearing and billet compressor wheel. I would think $300 to $400 is reasonable for a working turbo or does it need to be cleaned?
If it's off a 2003-2004.5 it will sell like hot cakes. That's the early one before ford modified it to get rid of the whistle. The diesel heads love to rebuild those.
2005 E350 RB 6.0 PSD for extended fun
1989 Landcruiser FJ62 for local fun
2011 VW TDI Golf for hwy fun