I will offer you 8% discount,
the cost for 175 black 18-20inch ostrich feathers is $178X1.75X92%=$311.5X92%=$287
the cost for 175 black 12-14inch ostrich feathers is $75X1.75X92%=$132X92%=$121
the shipping is $20.
so the total is $287+$121+$20=$428