Sega has released DLC Season 3 for Hatsune Miku: Project DIVA MEGA39's on Nintendo Switch.
This DLC includes "Extra Song Pack 12th~18th" for the PC version of the game, priced at 660 JPY (5 USD) for each pack. Meanwhile, the whole package, including all Season 3 packs, is available for 3,500 JPY (25 USD).
You can buy all 12-18 packs for a lower price
Source: 4Gamer
Contributed by nado