I found this nugget about what the Pacers might be asking for Sabonis:
Regarding Domantas Sabonis, one NBA executive told me he doesn’t see the Pacers moving Sabonis unless they get a Nikola Vucevic type of package in return as Orlando did when they traded the All-Star center to Chicago last season.
https://hoopshype.com/lists/nba-trade-talks-james-harden-ben-simmons-domantas-sabonis-more/Assuming that's true, the Magic received two firsts (top-3/4 protected), a lottery pick who wasn't living up to his full potential (Wendell Carter Jr.), and salary filler. I'm not quite sure the Celtics have a player of Carter Jr.'s caliber, but what about:
Pacers receive:
Al Horford
2022, 2024 unprotected
2023 2nd round pick (from Houston if not pick 31 or 32)
Celtics receive:
Sabonis
Justin Holiday
It's not quite the Vucevic haul, but the C's picks are fully unprotected unlike what Orlando received, and it's certainly possible this year's team falls flat on its face into the lottery. Do the C's need to upgrade that 2023 2nd into a future 1st? Holiday isn't exactly considered a throw-in, but he is there for salary matching purposes. If the C's added a prospect like Romeo or Nesmith, that would like bump the Pacers into the tax, which is the other reason I added that (potentially very good) 2nd in place of a prospect, as I imagine avoiding the tax is critical to Indiana.
If the Celtics gave up something like this, what would you think? The more I've watched the teams play, the more I think Rob Williams is a better fit next to Sabonis than Turner is, and Sabonis could really serve to unlock the C's offense as a passer in ways that Horford cannot. Could he be a successful third star next to the J's?
Financially speaking, the C's would (likely, barring Jaylen or Sabonis being late additions the all-star game/surprising All-NBAs) avoid the tax this year, and wouldn't have an unmanageable situation next year either (pending other moves).