Stepper motor - NEMA-17 size - 200 steps/rev, 12V 350mA : ID 324 : $14.00 : Adafruit Industries, Unique & fun DIY electronics and kits
Stepper Motor Basics
ACT 17HS5415P1X6: Stepper motor, 4 pole, 1.8 °, 4.2 V DC at reichelt elektronik
High Quality 2-phase 4-wire 42mm Stepper Motor 0.2 N.m 17 Teeth Stepping Motor 1.8 Degrees Stepper Motor Power Motor Accessories - Stepper Motor - AliExpress
Stepper Motor with Cable - ROB-09238 - SparkFun Electronics
What is a Stepper Motor? | All About Stepper Motors | Adafruit Learning System