Well, if you don't want a dash install, you've got the Midland 75-822, which
is probably one of the rinky-dink cigarette lighter radios you mention.
There's also the Cobra "HH Roadtrip" which is basically a handheld that
comes with a magmount kit to let you put the antenna on your roof. But
that's probably another rinky-dink radio.

Or you could just throw any mobile radio on the passenger seat or
floorboard.