It seems to me if you have a large product to ship it will be costly. How do you figure out the shipping when the costs are different depending on where you send it? Is there somewhere that you can go to get the shipping calculations before billing the buyer or do you do a standard shipping across the board?
USPS has a calculator and I think a table where you can check shipping costs. But my best recommendation is to work with their flat rate boxes. You pay one fee regardless of the weight, with different size options. That’s how I ship all my stuff. Check it out!