It depends really. Amazon.com, no of cause not, the US is huge for small countries, you do know the shipping cost.
I work for a company that has seven webshops, in six countries. We work out how much it will be to ship an item, on average and just include it in the price of the product. If the customer orders multiple item, we save a bit of money on shipping for that order. So in our case, because one webshop only shipping within one country, we always have a shipping cost of zero (it no zero of cause, it's factored into the product price, but it easier to figure out the actual cost of a purchase ).
I work for a company that has seven webshops, in six countries. We work out how much it will be to ship an item, on average and just include it in the price of the product. If the customer orders multiple item, we save a bit of money on shipping for that order. So in our case, because one webshop only shipping within one country, we always have a shipping cost of zero (it no zero of cause, it's factored into the product price, but it easier to figure out the actual cost of a purchase ).