According to the Panorama Room:

Ticket prices range from $250 to $1500.

Or you can watch for free almost anywhere on the Queens side of Roosevelt Island particularly south of the Queensboro Bridge or on the Roosevelt Island Bridge.
@Rooseveltisland real Islanders know the bridge is the best place to see the fireworks pic.twitter.com/dt3ARamrpa
LJ Rader (@LJ_Rader) July 5, 2021
