Laptop chargers in general use 19v whereas phones and DS chargers are 5-10v. As the car has a 12v supply a laptop charger is going to more expensive (because stepping a DC voltage up is a lot harder than stepping it down) so no you won't find one for under a tenner. but there are some cheaper ones around http://www.inkino.co.uk/zen/index.php?m ... s4t5s0as04 of course the quality might be dubious, I've no idea.
I've avoided inverters for laptop charging, having read posts on other forums by people who've had their PSUs (and sometimes the laptop too) fried by a cheap inverter plugged into their car, having said that I can't find them now, it was a while back I was reading up about it.








