"Chogokin" ("super alloy") is the manga equivalent of Marvel Comic's adamantium, introduced as the building block for the pioneering piloted mech Mazinger Z. In the '70s, "Chogokin" also became Bandai's Popy brand's name for die-cast metal figures. Generally, it's for mecha, but apparently Fate/ characters have enough armor to warrant Chogokin figures.
Anticipated Saber and Gilgamesh were on display at this past weekend's Dengeki 20th Anniversary event. Saber was previously previewed, but she now has a February release scheduled at 7,875yen ($99).