Campgrounds in the Florida Panhandle

I bought my rv back in November and have been at home making changes and setting it up to the way I want it. I also moved to Florida awhile back, and thought getting the rv would be a great way to travel with my fur babies and see more of the state. However, in my excitement I started looking at State and federal rv camping sites online. I found that alot of the more popular ones were already booked. I set my Florida Keys trip up in December of 2016... however i couldn't find openings in the 3 state parks I booked till September of 2017. John Pennekamp, Bahia Honda, and Long Key...I was extremely lucky to find those locations back to back. However when I started looking that was not initially on my radar. After talking with other local Florida experienced rv ppl here. They told me that unfortunately they have to plan State and Federal Park trips here in Florida. However they say finding other places like KOA, ect is alot easier. But it can be pricey. Often $67.00 a night... Also I hear parking at Walmart here in Florida is almost impossible unless you just get lucky. I really haven't experienced any of this first hand. I have only tent camped until now. However this is what I've heard about it so far...