So far I see this one for $249:
Have you imagined to use 2 18650 batteries on a laser pointer? Gatling Stretch can do that. and this laser has 3 wavelength and various output.
If it supplies the correct voltage --in this case you need one that supplies 8V --common sense. 12volts from a car battery is not what the laser was designed to work on and probably ruin/smoke the driver in the laser .What will be the beam size/shape of this beam at 600yards -- 1watt green laser with 10x beam-expander? says $389.99.
520nm green laser pointer, 520nm 700mW 1000mW green lasers, 700mW 1w green laser diode 520nm JETLASERS520nm green laser pointer, 520nm 1000mW green lasers, portable green laser best, jetlasers green laser 515nm, 1w green laser diode 520nm JETLASERS, 700mW 520nm laserswww.jetlasers.org
Also, will any of these lasers run off of the cigarette-lighter in your vehicle? (This one lists some sort of AC adapter...)