We have 2 nights comning up at Chiracaua but they were the only 2 available, Looked at Picacho this morning, kind of sparse thru March but April has a lot of openings.
We are in Benson, 25 m north of Tombstone. The Benson SKP park has boondocking sites for $5 a night, not sure if you have to be members now, didn't used to, but covid, not sure if it changed back. I can check.
Number of CG's in and around town, but commercial. Our park is a Passport Park, so $25 a night. pool jacuzzi, other things, plus a short drive to see Tombstone. The parks down there are usually full and pricey.
There is also a campground in St David at the Monestary, they are reasonable, small with hookups.