I lives in South Korea. When I buy & bring the 1L resin, I must pay the duty about 18% of ‘$149+delivery charge’ if there is no mark of origin(in this, case reduction of duty due to South Korea–United States Free Trade Agreement is impossible).
In Korea, if ‘product price + delivery charge’ exceeds above $150, I must pay the duty.
But if ‘product price + delivery charge’ is below $150, there is no duty.
So, I suggest adding the different volume of resin in store. For example, $111.75 for 750ml, $74.5 for 500ml of resin.
Thanks for reading.