Yeah, I'm from France and I'm able to speak 5 languages
Well ... I don't know if I'll pay for staying in the family (Volunteering, I think)
But here are the prices for the courses (only) :
(Being an exchange student for one year is cheaper, but I can't do it ...)
July : 円265 000
August : 円275 000
September : 円255 000
You can't ask for a host family if you don't take the courses.
You can do free activities & paying activities (about 円2000~3000 each)