Lake Louisa is the closest State park about 15 miles out, $25~ and in the woods. Tropical Palms is `$40-60 and maybe 6 miles out. The Kissimmee KOA is $60-80, 8 miles out and a very nice, small (spotless)clean, urban park. My kids like the Fort and the KOA.
Disney parking fee broke $20 and its, gulp $40 for preferred; that better be a covered garage. If staying at the Fort you can use the bus system, boat to Magic Kingdom or just drive to the parks (all free). If you have never been to Fort Wilderness, it is something to experience. Yes the prices are getting crazy and that keeps us from staying there more than once a year. For us it is a destination by itself. We bring bikes and ride all over the 700 acre place. We we started camping there, my kids were more happy to return to the Fort than they did going to the parks. We like the full hook ups sites 1600, 1700 and 1800. Haven't been to a Disney park in 5 years.