You might have noticed that the “Total with shipping” column label used to have an asterisk next to it, which referenced a footnote that said that shipping costs were estimates. That wasn’t entirely true: some PCB manufacturers provide exact shipping costs to PCBShopper while some do not. Only in the latter case did PCBShopper estimate the shipping costs.
One of our users, Alex, suggested that we indicate which PCB manufacturers we show exact shipping costs for, and which we show estimated costs for. That was such a great idea, we kicked ourselves for not thinking of it. We have now implemented it. For some prices in the “Total with shipping” column, you will now see a “(est.)” which means that the shipping costs are estimates.