The individual games can also be preordered here:
https://www.lacedrecords.com/products/halo-combat-evolved-limited-edition-deluxe-double-vinyl
https://www.lacedrecords.com/products/halo-2-limited-edition-deluxe-triple-vinyl
https://www.lacedrecords.com/products/halo-3-limited-edition-deluxe-triple-vinyl
Estimated to ship April 2025
IGN also has them on their store, same price, but the vinyls are only black:
$200 after shipping for me in the US for the boxed set, super expensive, but I have wanted vinyls of the OSTs for years and, until now, I think only 4, Infinite, and maybe CEA had vinyl releases, so I’ll take it.