In a funny state of New Jersey, in a county where they don't sell flashlights on Sunday, I found this inverter for $29.99 only. Couldn't skip this deal. Only last weekend did I get around to wiring power line from engine compartment and initializing a ground wire from under rear seat. This inverter is under driver seat, for now. Next thing to do is to hook it up.
I think this would be sufficient to power up laptop and charge my Android. Surely, it is a bit weak for a full blown carputer, but I doubt carputer would be something I'll embark on any time soon.