i sent my motor from ca to mi to angus for $58.00 on way with $500.00 insurance. when he sent it back to be with all the goodies it cost $66.00 with $1000.00 in insurance. that was with Fed-Ex
another thing. a cardboard box is not going to work to sh*t it. you have to get a rubber made tub lined with card board and then zip tie the lid closed. i also printed up Fragile signes and taped them to every side of the box.
here is what your going for when you ship a motor.
Shipping instruction