ALK Technologies, Ltd. has CoPilot Live North America (iTunes Link) in the iTunes App Store for $19.99 (34.99 – 15 instant savings) for a limited time.

CoPilot Live turns your iPhone 3G/3GS into a full-featured GPS navigation system with detailed USA and Canada street maps. It’s your personal travelling assistant that’s always at your side, ready to guide you with turn-by-turn voice directions and keep you better informed with useful live information about your route.