Frankly, I think you'd be lucky to get 2* for that. It's a very busy time. A site I recommend for europe hotels is
www.venere.com You could also try Priceline or Hotwire, but I'd be surprised if they had good inventory during the show.
What days are you planning to be there? It's on my calendar too!
And a suggestion from a show alumnus -- if you can walk a mile or so, take the RER to Le Bourget and walk to the show from there. Last time I waited over an hour for the stupid shuttle bus.