Don't confuse DJI's Maximum Altitude above the launch point with AGL. FAA couldn’t care less about what height you set your Maximum Altitude slider to. FAA insists no more than 400 feet above the ground directly below the aircraft, which can...
The de minimis exception applied to shipments. The $800 allowance (for Canada) that was mentioned is for items an individual purchases while traveling and brings back to the US. The figure may be $200, $800, or $1600, depending on which country...