When I visited in September 2005, I had to do the complete St Michel de Grandmont Priory visit. There were no longer any free visits around the grounds, and I could only do the guided tour of the priory and grounds after. They said it was something to do with animals in the park, and it was quite disappointing.
I did the full tour on a half price day, and it was €5 and 2+ hours of visit. Despite being led to believe I would see all the dolmens within the grounds, I only got to see the Coste-Rouge dolmen and a few other odd stones, and not the other two dolmens within the grounds.
Something is not right. This message is just to keep things from messing up down the road