USB and Ethernet Mach4 CNC controller - PoKeys57CNC - Polabs
MK2 100Khz 4 axis controller board Instead of Mach3 4 axis interface CNC controller MK2 CNC USB board for Stepper motor / Servo - AliExpress
Amazon.com: Walfront Mach3 USB Interface Board, USB CNC Controller 4 Axis Motion Control Card, Interface Breakout Board for Stepper Motor Driver : Electronics