Cheapest engine for Used 2008 ford Kuga Diesel

Ford
Model 1-08-10 2000cc Engine Code: G6DB TDCI 4 CYLINDER INLINE 16 VALVE
Engine Code: G6DB Next Step
Ford
Model 2- 08-10 2000cc Engine Code:G6DG TDCI 4 CYLINDER INLINE 16 VALVE
Engine Code: G6DG Next Step