Hi Paul
Inside the black box there is the following:-
286 computer mother board
3 * 24v 3 amp stepper motor drivers
24v 10 amp power supply.
Looking on ebay brand new is;-


UK CNC Single Axis 4A TB6600 2/4 Phase Hybrid Stepper Motor Drivers Controller
£8.24p each 24.72p for 3.

24v dc 10 amp power supply

DC 12V 24V 5V 10A 12.5A 15A 20A 30A Universal Regulated Switching Power Supply
UK Stock! 5V 12V 24V !3A 5A 8.5A 12.5A 30A ! 10W-400W!

Power Supply £12.23

£25 and £15 = £40 + p&p

Does that seem ok ?

Dave