In reply to FionaMc:
There's a very basic campsite at Moulin de Cost, a couple of km outside Buis and about 5km from Mollans and the road to St Leger. I think they're open until the 1st of November but you're better off emailing them to double check.
https://www.camping-moulindecost.com/index.html
If you know anyone who wants a bit more comfort we have a couple of studios for rent to climbers, hikers and cyclists.
Cheers,
E