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Here is a link to the 5A stepper drivers I have been using:
http://www.ebay.com/itm/CNC-Single-Axis-TB6600-0-2-5A-Two-Phase-Hybrid-Stepper-Motor-Driver-Controlle-HR-/252548476426?hash=item3acd0fee0a:g:BN0AAOSwYIxX4KZC

I used an old ATX Dell server power supply with 60A on the 12V rail (this powers all the stepper drivers and extruder heater etc), although I will be upgrading to a 24V supply in the future for faster non print movements (less time for extruder ooze)