Zach the Producer is looking into it at the moment and hopes to come up with a solution to this problem, stay tuned.
edit: also to mention that the DVD packages will be available through Paypal when it's released, but at the moment, the funds being donated are to aid the development of the feature eg. production cost, interviewee fees etc...allowing the donators to become benefactors to the project, so if it is a case your only interested in purchasing the finished product you will be able to do so via paypal.
hope this helps.
edit 2 : an alternative method of payment which may suit is https://www.3vcash.com/
as pay as go credit card transactions