Gold Wing Trading Inc is an Amazon seller of drones under the name SilverCircle and Cheerwing USA. They offered free shipping and then added it anyway, refusing to refund it. Then a few hours after my purchase they lower the price by 25% and refuse to refund the difference. This company can best be described as deceptive with switch and bait tactives. It is sad that their CEO Maggie Jun Lei and President Elden Hong Lei encourage these practices.