Make him an offer.
If he wants over the odds, tell him to stuff off.

The whole point of FA is you are going to pay overs for players. That makes sense because you basically get a free player, other than the money. (No draft picks or trade needed to get them)
If you want a bargain, go to K Mart.

If you want to drag a good player away from where he is playing, you pay overs. It's pretty simple.