The Source has Nexxtech Auto Power Universal Car Adapter for Laptops for $19.96 right now (save $80.03 off). Shipping is free to store for pickup and the promo code TS4411 should also still work.
Product Summary
The Nexxtech 90W laptop charger allows you to power up your laptop on the road from your vehicle’s 12-24V DC power source. Automatic voltage selection provides the correct output voltage to your laptop, and the built-in USB port allows you to charge your other mobile devices, like smartphone, tablet , or iPod, at the same time.
Comes with a selection of 11 laptop charging tips to fit most laptops, including IBM, HP, Compaq, Acer, Samsung, Sony, Fujitsu, Toshiba, Lenovo, Delta, Gateway, Toshiba Liteon, and Dell.