There are two Killzones still on the website (Fronteris and Sanctoris). Was there a third?
Killzone: Mechanicus(what's in the upcoming Starter)
Killzone: Deathworld Forest
Killzone: Fronteris(which sold out REALLY fast in most localities)
Killzone: Sanctoris is some of the stuff from the original KT starter.
There were more,
Killzone: Wall of Martyrs
Killzone: Sector Munitorum (Shipping containers)
The Original starter had its own, Killzone: Sector Imperialis.
Plus, Arena amd Rogue Trader boards were considered their own Battlezones