Two types of D50:
 AirRoc D50: maximum drilling depth of 30 meters, diameter up to 14 cm
 FlexiRoc D50: maximum drilling depth of 45 meters, diameter up to 13 cm
 
 A Flexiroc D50 costs around 440,000 euros new and 110,000 euros used for ten years.

 The AirRoc D50 drill, the  amount will be lower in view of the type of drill. This model is not found too much in Europe but it can be found in the United States.
 
 Otherwise, second-hand Roc F6 model: 85,000 euros from Europe for a 2005 drilling rig.