Boucher (who the Rangers had an interest in prompting Dorion to draft him at #10) + 2024 2nd for Laf.
It would almost certainly cost more.
24YR old Sam Bennet went for two 2nds after 5 seasons of stagnant development after a solid rookie year
21YR old Kyle Turris went for Rundblad (top prospect at the time) + 2nd after a 25P/65GP season
23YR old Ryan Strome returned Eberle after a 30P/69GP season
21YR old Griffin Reinhart returned the 16th OVR pick + a 2nd after struggling in his first AHL season
21YR old Dylan Strome returned Nick Schmaltz after a 6P/20GP start to the year
21YR old Jesperi Kotkaniemi got a big offer sheet and a 1st+2nd from the Canes after a 20P/56GP season
21YR old Kirby Dach returned the 13th OVR pick + a 3rd after a 26P/70GP season
21YR old Alexis Lafreniere is coming off a 39P/81GP season, which is better than any of the other names on this list and he was thought to have more upside than any of them pre-draft.
There are cases of guys like Puljujarvi, Kravtsov, L.Brown, etc... basically getting nothing in return after struggling by their early 20s, but most of the time these change-of-scenery deals involving a former top prospect result in a significant asset or two coming back in return.