As a seller I feel somewhat done by Trade Me and NZ Post. When I created an advert I obtained  shipping costs quote via Book A Courier on Trade Me so it could be included in the ad. which is subsequantly did. Bidders would know the shipping costs involved. The advert and sale notification reflected the various shipping fees for NZ and showed a cost of $17.38. The buyer paid accordingly, so far so good. However, when I booked the courier after the conclusion of the trade, using the button on the notification and using the same measurements (were already entered) it returned a different rate,...