All these skins will be in future updates so if you don't want to pay the 10$ don't just wait till they are released in future updates and grind them out with gold and silver packs and you won't have to spend a dime!!!
Recruit - Bronze
Made your first hot drop into HaloWaypoint.com
Halo 5: Guardians MP Beta participant.
Become a member of an active Spartan Company.