If you decide to stay in NOLA, I highly recommend Pontchartrain Landing on France Dr. It is north of the chaos and crime of the city, just off of the lake. You are surrounded by boats and docks. Just don't let your GPS bring you in on France from the south. That way is lousy. Come in on Press which is a parallel street. It is an primarily an RV park so there are some pricey rigs in there, but small campers are welcome too. There is a full restaurant and bar there that are also nice. Showers and restrooms are available and more like your house than a campground. Passport America members pay $39 a night.
If you prefer to stay north of the lake, there are two Passport America campgrounds east of Hammond, just north of I-12. Hidden Oaks is $25 for PA members, and Yogi Bear Jellystone is $22.50-$35 for PA members.
Yeah, I like discounts when I can get them.