Say what you want about the FAA in general, but it's hard to say anything
bad about the charting folks. The product they produce is excellent, and
they're constantly looking for ways to improve it. You can download the
data for free on the net, or get it in printed form for fire-sale prices.

If you want to compete with them by reselling either the raw data or the
printed material for a profit, they're cool with that too.