You can buy pre-scanned charts now, in GeoTIFF format. Not sure about WAC's, but definetely sectionals. If you don't need up to date, you can even find free ones. Here's one place to get them:

mypilotstore.com

However, I don't have any need for a laptop on this trip, and that's a heck of a lot more bulk that a couple of charts. And why should they allow laptops? After all, they are now powerful enough to design nuclear weapons. Nuke-u-lar weapons on an airplane? OMG!