I have three automation direct Nema 23 276 in-oz stepper motors.  All three are in good working order.  I have been using them on my Harbor Freight 12 speed mill/drill for about 3 years.  They have been great motors, but where too small for the G0704.  New, they sell for $39.97 each.  I am asking $20 each plus shipping cost.  I have shipping set at $10.95 for a flat rate box.  Contact me prior to purchase with a zip code and I will check cost in a non-flat rate box to save some cost.