If you open an account with certain brokerages, they will give you the Zen-fire data feed for free. If you want to trade through Ninja, Ninja charges like $60 a month. I've been using Zen-fire with Ninja since I started a few months ago, and I'm very satisfied with it..

yes mirus and amp futures are providing real time zenfire futures data free for a month.. $2000 to open account with AMP & ES Margin is $500