Considering how long people have been able to pre-order Halo 5. They probably did ran out, but when you go and pre-order it you can try asking if they have any left.
Recruit - Silver
Made your first hot drop into HaloWaypoint.com
Halo 5: Guardians MP Beta participant.
View your Service Record on the web.
Become a member of an active Spartan Company.
Awarded to subscribers of the Halo Legendary Crate