CNC USB controller Mk3DRV (4 axis) with integrated stepper drivers - Planet CNC
4 Axis USB CNC breakout board interface board controller USBCNC with Handle control USB port - AliExpress
CNC USB controller Mk3 (9 axis) (ON SALE 20%) - Planet CNC
How to DIY CNC USB CONTROLLER - CNC & 3D Printer : Inspired by LnwShop.com
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