Hi hoopstar!
I am not really bidding for this project as the minimum quantity we usually handle are higher and we purchase from China, starting from 200 units and up. For 50 units, it makes sense to buy it directly in cali.
However just throwing my 2 cents, I hope I can help a fellow freelancer!
Material: you would want to choose silicone instead of latex, as latex can cause skin allergies
Costs: i refer to china factory costs, not sure what you can get down there in Cali.
There is a fixed cost for the printing set up, 42 USD per each colour u want to print. Or 48USD for a debossed/embossed logo. Then the price for each bracelet should be around 0.20 USD (just embossed/debossed logo) or 0.24 USD for 1 colour printed logo.
Of course the bigger the quantity, the better the price. Just for your reference, 10,000 pieces would go for 0.09 USD each. Good luck with your business! Raf