If I look around a bit I'm pretty sure I can find a unit machined out of pure unobtainium by cloistered, pure, unblemished virgins using a cyclotron driven by a donkey wheel. They sell for $100,000 each but it comes with a no-questions-asked warranty for 1000 years offering replacement or double your money back refund, your choice, providing you hand deliver the defective product to their service center on the dark side of the moon.

But think of the 'quality'. If you aren't willing to go with a 'quality' product you aren't serious about survival. You simply have to go with the best because ... <insert improbable situation where your life rides on a flashlight working here> ... could happen and then where would you be?