Based on our experiences with previous campaigns, it's always good to insure goods that are shipped domestically and internationally for exclusive items that aren't easily replaceable. For US backers the shipping/insurance is included for the $25 reward. For international backers the shipping fee is $8.
For those that don't know how to increase their pledge it's very easy. Visit our project page and click the blue “Manage" button that appears next to your pledge amount. Increase your existing pledge by $33 in the pledge amount box.
Don't see the answer to your question? Ask the project creator directly.