If your in the US try one of the kits from Harbor Freight. Its like $150 for a 45 watt kit. Add some deep cycle golf cart batteries and a inverter. Im going to try it out this weekend. I have a BFL jally and a netbook that draws a little over 38 watts.
You don't need an inverter. Both laptop and BFL run on DC power. If they don't run @ 12V (battery output) you will need a DC-DC powersupply to convert the 12V to what the laptop and BFL expect.