RCMoment offers the Sunnysky R1408 3800KV 2-4S CW/CCW Quadcopter Drone Brushless Motor Kit 4-Pack for $52.99. Coupon code "R1408" cuts that to $46.99. With free shipping, that's the lowest price we could find by $6.

Note: It ships from China and may take up to three weeks to arrive.