We can't accept PayPal for Kickstarter funds, however, this is the method multiple other projects have recommended:
1. Get a Ukash voucher from their site (Ukash.com)
2.Follow the instructions there to get a Ukash NEO card, which can be used as a Mastercard on Amazon. (Please read the rules at their site first - we're obviously not affiliated.) Apparently you should add an extra $1 onto the card for Amazon's account processing system.
3. Pledge through Amazon with the Ukash NEO card the same way you would with a credit card.
There seem to be multiple explanations online on how to do this if you get stuck - hope that helps!