Last year, his afterschool program made it available. As an epee man, I got him to give it 5 lessons before making a decision. He decided he loved it. The instructor is a former member of the US national team.
At his request, I got him the other two weapons for his birthday. Over the summer, he worked out on epee with me and on Sabre with a former collegiate champion who happens to be a friend of mine. When he returned to the program, the instructor commented on how much better he had become and how he had developed a variety of tactics, instead of simply charging or lunging.
There are also several high schools in the New York City system that offer fencing. I suspect that Title IX may have had something to do with it.
You could probably use the title IX argument to get your kid's school to start a team.
In addition, he has had a few sessions at Metropolis Fencing in Manhatten.