... They can send you 6 LED bulbs for a $1. if I sent that to China it would easily be $30
Yes, this one baffles me too!
The post office was part of some international postal union which set prices for trade between countries. China somehow was considered a developing nation and therefore got cheap rates to send packages to the US. Not the other way around. The postal service has lost over 300 million a year delivering packages from China to the US. Enjoy it while it lasts, those prices will probably go up soon.