Sold separately, but being the best couple in the universe, I suppose Macross fans are aiming to get both Max and Milia's units as a set instead of just either one of them. XD
VF-1J Max's unit with Super Pack
VF-1J Milia's unit with Super Pack
Apart from the color variation, the specs for the two are completely the same: made from ABS, POM, zinc alloy and others, 25cm in length when in Fighter mode. Accessories include pilot figure, attachment for Macross Stand x2, attachment for the Fighter's nose, marking sticker, non-movable option hand unit x2
Weapons include: (from standard VF-1 series) gun pod, micro missile pod x4, 3-tube anti-ground missile missile x4, (Super Pack:) backpack missile pod x2, booster packing x2, micro missile pod for the arm x2, propellant tank for the leg x2, large anti-ship Reaction Missile x6.
October release, 13,440 Yen each (inclusive of tax).
Images from Yamato: Max's unit, Milia's unit.
On a not-so related note, new images of Armor Plus Ex Gear (Alto Saotome's Ver.) from Macross Frontier, produced by Tamashii Nation:
Late September release, 7,875 Yen (inclusive of tax).
Images from Tamashii Web.