Skinner - more than you're willing to give up. He's too valuable to the Canes in being one of the only legitimate scoring threats on the roster than any fair trade would get. He only gets moved for a significant enough upgrade at the C or F spots to make it worth their while.
Faulk? He could be a little more expendable. You're likely to get a little more of an even trade for him, but realistically, if he gets moved its for a legitimate 1st line player, likely a winger. Not sure he'll command 1C without the Canes adding.
I would think there is enough in the prospect pool and up front in general to acquire Faulk without dealing Marner or Nylander, IF Faulk becomes available this summer
The Canes aren't in the market to be dealing productive players for B-level scraps. If you're going to come after him, you better be prepared to offer up something significant, like a Marner or a Nylander. He's getting moved for A-level talent, not a combination of 3 Bs and Cs. We have enough of those.