Amazon is offering the Duracell 175-Watt Pocket Inverter with 2.1-Amp USB Port (DRINVP175) for a good price.

Yes, this device will let you charge your laptop in your car

Next best price on Google is $42.72 shipped

Amazon Price is $39.99 Shipped

Use coupon code RFY9V5WA to get $12 off

Final Price is $27.99 Shipped