Sorry Bryan. I missed your post. I'm currently in Nishi-funabashi but hope to move fairly soon. When I do move I intend to find a place that offers free instruction in Japanese. A few community centres around seem to. I've tried one before but quit. A good way of making friends too. (not the quitting part). Cheers.
There's a good dojo in Funabashi, or at least there used to be. I trained there a couple of times back in '96. Yamashita sensei, if I remember correctly, although my brain is dim. It was a 3 story budokan about 5 mins from the main JR eki. I could probably take you to it if I was there but I can't remember directions.