There were a couple of threads in the last few months regarding running various electronics off the 12v cigarette lighter. For those who might be interested and have similar needs, I recently purchased off of ebay a *high-power universal* 120w DC to DC adaptor (hard to find locally, most are only 70w or 90w capable), to handle my laptop which requires 19vdc @ 6 amps, or, ~ 120watts. This is a voltage selectable adaptor.
So far it is working as advertised, and much more power efficient than running a DC to AC power converter and using the laptop's AC power brick. The price is very decent and comes with the most common power jack connectors. The only downside is that it is made in China (like everything else) so long term reliability is an unknown, but it seems to be pretty solid. I'm sure the seller has more in stock as he runs a brick and mortar camera/video store in Florida, and if you search eBay you'll find several other items that are 120w capable.
Just an FYI
Another similar item with even better pricing:
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Guest Message by DevFuse
DC to DC Car Adaptor
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