1st round pick, a 2nd round pick,$$$$ to pay his buyout, & hit cap requirement
It is a great deal for the Jazz, who were going to lose Dunn for nothing, and turned that pick into Collier. That 2nd pick could be a Filipowski, or part of a big trade. The Clippers also gave the Jazz the money needed for his salary and buyout, so they have literally nothing out of pocket for helping them free up a roster spot. It is similar to the Toronto trade for Kelly O.