Campgrounds offer one or more of a variety of discounts.
FMCA members enjoy a discount at a number of campgrounds.
AAA members also enjoy a discount.
KOA offers a discount to KOA members at KOA member campgrounds, but you pay an annual KOA membership fee.
Good Sam Club members enjoy a discount at a number of private campgrounds.
Passport America is a membership organization allowing you to get a 50% discount for a limited number of nights at one of their member campgrounds. There may be blackout dates at some member campgrounds. You pay an annual fee for membership in Passport America.
The Escapees Club offers member discounts at their own member campgrounds. Some independent campgrounds also offer discounts to Escapees members.