The 12-volt connector/charger for the laptop doesn't come totally cheap -
around $100.  But I wouldn't be on the road without it, it's great to
have.  I hardly ever get around to watching DVDs, but they're nice to have
too.  Most laptops come standard with a DVD player these days.
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radio shack has two varieties of these laptop DC to DC adapters.  one under
the radio shack name for $50-60 and one under the i-go or some such
similar name for $100+.  the fancier one does all kinds of stuff like hook
into the systems on airplanes and such.

jonathan