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Redesign it a little to be able to injection mold all three pieces from a single straight-pull mold and quote it from http://protomold.comprotomold.com.  I would guesstimate around $3k for tooling + $1-2 per piece for resin.  Set up a Kickstarter or Indiegogo project for $10k and offer it as a $10 reward, get 1000 people to donate and BOOM, you're in business.  Get the word out and you should be able to hit that target easily.  Even if you don't, you'll only be out your time.