Coaches associations???

I am going into my 2nd year of coaching at the jr. high level (football, basketball, and baseball), and am wanting to beef up my resume. Are there certain associations for coaches that you would call both legitimate and beneficial? Of course, I don't want to drop $1000/year on dues, but I do want to find a good organization. And I'd prefer one that was not specific to a particular sport, since I still can't decide which sport I'm best suited for in the long run.

Thanks for your help and just so all of you know, I'm a big fan of this board. Been lurking on it for a few weeks now and am impressed with the collective knowledge.