Blurb from The News-Herald out of Ohio claims Rasheed Wallace asked for a buyout before this season to go to the Cavs.
“Sources say Pistons forward/center Rasheed Wallace asked for a buyout this year, but management declined. Some observers think the possible buyout would have been to join the Cavs. He’s an unrestricted free agent this [...]

We know the McDyess situation. Antonio left a ton of money on the table when he was bought out by the Nuggets.
To be exact, no NBA player has ever left so much money on the table in a contract buyout.
SI’s Ian Thomsen:
“League sources believe the three bidders to be Cleveland, San Antonio and Boston. [...]