4x Allegro Microsystems MOTOR DRIVER ICS 4.75-5.5V 0.65A 16-Pins, Stepper SOIC W | eBay
3pcs ALLEGRO A2918SW STEPPER MOTOR DRIVER IC A2918 | eBay
SparkFun Big Easy Driver Stepper Motor Driver Board for bi-Polar Stepper Motors up to a max 2A/Phase Maximum Motor Drive Voltage of Around 30V Includes on-Board 5V/3.3V Regulation Allegro A4988 Chip- Buy