It's true that CR123 batteries aren't as easy to find in stores as regular old AAs, but it's a fair trade-off. What you sacrifice in convenience, you gain in longer runtimes and greater illumination. CR123 batteries use a lithium-cell inside instead of alkaline, and output three volts instead of the 1.5 volts from a AA battery. So it allows flashlights like the F1 to blast an impressive 400 lumens while still boasting excellent battery life.
Of course you don't have to run the F1 at full power. You can extend its battery life even further by dimming its LED bulb to its lowest setting. But if you're going to drop $80 on it, you might as well go big or go home. More here.