There is not a gym that has Bas Ruttens name backing it. If you want personal instruction from him you must go to the Beverly Hills Jiu-Jitsu Club or go to one of his seminars.
You must get in touch with Shannon his rep and first see if he is open to the idea and second make sure he has the time. I had to contact her when I wanted to have three private sessions with him, I could only get two because he was shooting a movie and it is very expensive.
But I was in town and had the money and went for it. Here is her e-mail: firstname.lastname@example.org.
It will most likely take her one or two weeks to get back to you if you’re serious.