Flack Friday at Peony Shop is not for overseas shipment.
I ordered twice from them (last year American orders did not work out) and shipping cost was not bad at all. Besides 10% of the order cost (import duty) there were packing cost (number of roots X 0.50 Euros) plus Shipping cost (36 Euros this year when I ordered 8 roots and 9 Euros in 2018 when I ordered 2 roots).