Talk about cheap stepping motors and there’s a good chance someone will mention the “28BYJ-48”. Or maybe he or she will not remember the part number and say something along the lines of “That 3 dollar stepper used in air conditioners! You know! B28 something!” Truth be told, it doesn’t get much cheaper than 3 dollars. The 28BYJ-48 is the queen of ultra-low-cost steppers.