ABS plastic Case Material and 98*30mm Size compass

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Hi !
My name is Peter, and I was wondering what cost for shipping 500 pieces to the United States.
Also, is the price accurate that is listed because several suppliers claim errors in listed prices. I find this highly unusual, and if not true, highly unethical.
My hope is that there can even be a discount as a first-time customer.
I would also like to know if the unit has alternative color or the cost for three Greek letters imprinted :
Thank you for your anticipated prompt reply.
Peter