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These guys have a buck boost in them for <$5
It doesn't have a "1000lm" emitter in it. That makes quite a big difference in the cost. It also doesn't include shipping.
I've got one a lot like that, and although it does take lithium, it is only in regulation from 1.4-3.2V. Anything higher and the current rises which leads me to believe it's boost-only.