That's going to be a LOT of post cards and I doubt the return will be worth the effort.
Might try a kick starter. Get people to invest now with a "payoff" once you get established. Percent off a purchase, dibs on a one off product, etc.
Look into grants. If you are donating profits to charities, there may be foundations that will help you out. You might want to look at tax status also. Non profit doesn't mean no profit. Non profit grants are popular.
Good luck





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