Most shipping services, postal and courier, publish their rates for various services, destinations and dimensions.
Most shipping services use dimensional rates, that is, the height, width, and depth of the package plus the weight to determine the rate to a given destination.
Various services give the shipper different levels of service, including speed, tracking or insurance.
And the seller is allowed to add a "reasonable" amount for packaging costs.
If your seller is charging more than you want to pay for shipping, you can ask for a different service. Do this BEFORE BIDDING. He is not required to say yes.
