Here is your order details,

if you make 15centerpieces,you need 15 X 50 =750feathers.

the cost for 750 12-14inch ostrich feathers is $0.62 X 750=$465
I can give you 3.5% discount,so the cost will be $465 X 96.5%=$448
the shipping cost is $20（you can get feathers in 7-9days）
the total charge for this order is $448+$20=$468