Wanting to be a high school exchange student in Japan

I was wondering if I could get some advice about being a high school exchnage student in Japan and what programs are good (but not too expensive).

By the way, I‘ve been to Japan before and know that I want to do this. I will be going to Japan for college and pursuing further things in Japan, so I am not worried about an exchange semester/year setting me behind in America or effecting my learning back in America. Im hoping to get friendships/connections in Japan and a much better language ability out of the exchange