You should charge for shipping, I do when I sell fabric/jewelry/Mixed Media and I sell to Europe and Japan a lot.

For the quilts use the Priority Flat Rate Large Gaming box that you can order online only - it's great for sending up to queen size quilts. It expands quite a bit girth wise and as long as you take the ends with clear tape you are fine sending from the Islands. I put the item in a large white kitchen trash bag to help slide it into the box, which also protects it from any dampness.

You're insured up to $50, get free tracking number, the buyer get an email for tracking. If you use PP for payment/shipping your label, you even pay less. Love it!