SainSmart CNC 4-Axis Kit with TB6600 Driver ST4045 & Nema23 270oz-in Stepper Motor, USB Controller Card, Nema23 Stepper Motor and 36V Power Supply: Amazon.com: Tools & Home Improvement
RATTMMOTOR 4 Axis CNC USB Mach3 Controller Breakout Board CNC Motion Controller Card Stepper Motor Driver with Cable for CNC Router Engraving Machine, Servo Motor, Stepper Motor - - Amazon.com