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$10 price drop. Rakuten.com Shopping (formerly Buy.com) has the Energizer WR2A3ACE Weather Ready 4-LED 17-Lumen Safety Flashlight for $5 with free shipping. Features 4 white LEDs, runs on AA, AAA or C batteries, is weather resistant and includes AA Energizer Max batteries.
$5
Specs say it's 26-lumen.
Yeah, I think the LEDs became more efficient after the initial design. I don't know what to make of this light. Around 5-10 years ago there were some LED lights using 2 x 1.5V cells with direct drive, meaning the LEDs saw 3.0V at full cell charge and went downhill from there (nominal voltage of a white LED is usually a little higher than 3.1V for full rated brightness) but almost all the budget lights you'd find at places like Meritline or Dealextreme with power LEDs (> 0.5W) have a boost circuit when it's a 2 cell light.
Both 17 lumens and 26 lumens are an odd spec for a 4 LED light. While that's enough light to navigate by indoors and a fair option to get better runtime in an emergency, I can't recall any LEDs rated as (26/4) 6.5 lumens each, it's too high a rating for the typical 100mW LEDs and too low for 250mW LEDs.
OK, after some digging these seem to use 4 x Nichia NSDW570GS-K1 (250mW but... ) underdriven, behind a custom optic lens, which is a far better option than the typical multi-LED generic lights. With 2 x C cells this should run for over 24 hours, though the spec sheet linked below claims 150 (!) hours to "end of usable light" on C cells, or about 55 hours on AA alkalines, about 17 with AAAs.
You probably won't want to use NiMH cells with this light as their (2 x ) 1.2V nominal voltage is low for direct driving white LEDs. It'd make light and run a long time but not nearly as much light for the first 10 or 20 hours.
One thing that isn't mentioned is that if it has AA or AAA cells in it, it'll probably float.
Datasheet: http://data.energizer.com/PDFs/wr2a3ace.pdf
In for three.
Out for none...