In reply to gazfellows:
I’d similarly recommend the inexpensive campsite at the Les Choslets roundabout, just before Argentiere, however be aware it closes for the season end Sept. Reopens early May.
If you’re thinking of heading there imminently, be aware most lifts stop running and mountains refuges close mid-to-late Sept. The weather typically starts to deteriorate too. One advantage is popular rock routes are markedly quieter.