We intended to for all prizes to have free shipping in the United States. Unfortunately, a few people have been charged for shipping for the larger pledge rewards, and Kickstarter won't allow us to change it at this point. This stinks. And we're very sorry about the confusion!
If you were charged for shipping and want that money back, we will happily PayPal you that shipping fee at the end of the campaign. Just let us know! No questions asked, we'll reimburse you.
The good news is this issue seems be affecting a small amount of people, probably less than twenty backers in total.
Sorry about the confusion and inconvenience! We want to make it right.