It is my understanding that when the current owner of Avalon took over, that Air Services who had previously designed the GPS NPA, and who had paid all the associated costs, gave the charts and amendments to the owners free of charge. It would seem therefore that Avalon is charging for services they themselves got for free. I believe AOPA wrote letters on the subject to Avalon owners several months back but had no reply. Due to lack of interest from GA operators who use Avalon in jacking up over the charges (they just add it on to the cost of the flight), AOPA did not pursue the issue - understandably.