Amazing hacks you have yold in your post. I have learnt a lot from this post. Though these hacks may look little or nothing to many. But i think with yime benefits from these hacks will gather a big pile back to us.
Different markets rates is common almost in every country. Even in countries with strict rates policies. There are wicked sellers who find ways to outsmart the country's laws about rate controll.
Some sellers spend some money on packing n in turn change the rate after their own hearts.

Thank you for sharing these gr8 hacks to the community....