Don't feel like paying the $30 asking price for a PlayStation Move Navigation Controller? There is a cheaper (albeit less comfortable) solution: just use the DualShock controller. At an E3 presentation about the Move, Anton Mikhailov confirmed that the two controllers are interchangeable.
This method of control was actually used at Tokyo Game Show last year, to demonstrate the newly implemented motion controls of Resident Evil 5. While using the DualShock may not be the most attractive way to play, it's certainly nice to know that you have an option to avoid the cost of entry.