Forge World has some new Castellax Bundles available over in their webshop. Go get yourself some.
From the announcement:
New Castellax Bundles
Primarily intended for shock assaults, the Mechanicum Castellax Battle-automata is a hulking humanoid machine thrice the height of a man, with a notoriously aggressive machine-spirit and an enviable reputation on the battlefield.
With our new Castellax Maniples you can field these deadly mechanical warriors in various combinations, either as a complete unit, five individual models or anything in between.
These bundle deals are available to order now. Models designed by Will Hayes.