Magos Macrotek Enginseer & Servo-automata is a Mechanicum kit. Games Workshop list it at £63.50.
More Mechanicum kits
Skitarii Battle-Pilgrym MarshalVultarax Stratos-AutomataSkitarii Battle-Pilgrym CorpusMyrmidon Destructor HostThanatar Calix Siege AutomataUrsarax CohortKrios Battle TankKaracnos Assault TankLegion Imperialis: Thanatar Siege-Automata CohortCastellax Battle-Automata ManipleTech-Thralls CovenantThallax Cohort