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OK folks - we have enough that I'm willing to say this is a goer.
Actual cost per ball is a wasps nipple over $30 I think. When I call for payments, I'm going to suggest a voluntary tax/donation on top of the cost price which will go towards getting extra balls to have on hand or as giveaways or whatever, but there is no obligation.
I'm going to take it everyone that has expressed an interest so far is firm in their commitment - now's the time to retract!
Don't send money yet, I'll get back to y'all on that