I think it depends on the team. With a contending team they wont want to give up to much,because they are making a run of course. It would be roll players in most cases and a high first round, two if lucky.
Some teams might be trying to get out of contracts, but depending on the player, why would you want to take on a contract that some one else is trying to get out of.
Could get lucky and have a player that wants out, but unlikely.
Lottery teams that don't want to be in the lottery any more because they have enough youngs, who with PP contract can buy him out and still have enough money to bring in a FA this season or wait till next. That can get a decent player at an okay contract, but also maybe a pick or two as well.
Best case McHale does an other solid by DA and gets a package with Harden for PP...