Why do you even want a FM system. I had to fight to refuse to use the system lol.
But thats just me, I didnt want a FM system cause it drains batteries, and requires more "effort" in keeping it from being lost or broken and taking with me to evry class and giving it to the teacher and then to the nurse after im done with school day.
Plus I'd hate to get "direct sound" to the teacher. (yes I was forced to "try" (really, just to show i gave it a try) and hated the direct voice)
Again thats just me because I dont have many issues in school being deaf with CI.
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If you want your son to have 2nd then Id recommend fighting because everyone has rights/access to these Fms due to disability act. Theyre probably only letting him have one instead of 2 because it saves the board of edu some money in the budget. Hearing impair budget is large considering covering all the students, (captions, speakers, notetakers, teacher(s) of the HoH, batteries)