In these tougher times however, there are a lot of former PA campgrounds giving up their affiliation. Nevertheless, it is still well worth the cost of membership as by he third night, you generally break even, so after that it saves you lots of money. On the other hand, if you do a lot of boondocking, or even State or municipal Parks the savings will be limited, and you'll find PA rules restrictive, ie most limit to week days, maximum 3 nights(some 1 night), or the one that drives me nuts, is a minimum of 2 nights, which is annoying when I'm looking for a place while traveling through an area.
Ed