I can't help you with a specific recommendation, but have you checked out
US Campgrounds.info? They show state, county, and city CG's in addition to SP's, SF's, NFS, and NPS CG's. You might find a city or county CG that has openings. Just another option.
Ken & Allison
2 Camping Cats (1 diabetic)
1996 4Runner, TRD Supercharger, Edelbrock headers
2007 Fleetwood Arcadia, Honda EU2000i
4 mountain bikes, 1 canoe, 4 tents, 8 sleeping bags, 2 backpacks
(You get the idea!)