Your most cost-effective approach is probably to go to any of a number of online education providers. They will provide you with the manual (~$100) and should also cover the costs of the examinations (IIRC ~$400 each) as well as practice questions, webinars, etc etc.
If you want to go it alone the title for the Prince2 manual is "Managing Successful Projects with PRINCE2", it is widely available through online book sellers. It is fairly well written (far better than PMBOK) so I didn't have a need to go with other books.