Alabama State Park reservation system is awful

Passport America costs $44 yr to join. They have over 1,700 campgrounds that participate and give a 50% discount off their normal rate. Each campground decides how many days the discount will apply, if it's valid every day of the week, or for example, only monday - friday, etc. You can look at the campgrounds on their website without being a member. There are a variety of types of campgrounds, including some resorts.