This eased my worries about the customs tax...
"As agreed in the Trade Facilitation and Trade Enforcement Act of 2015, signed by President Barack Obama Feb. 24, U.S. Customs and Border Protection (CBP) announced that March 10, it raised the value of a shipment of merchandise imported by one person on one day that generally may be imported free of duties and taxes from $200 to $800. This raising of the de minimis exemption is due to an amendment of the Tariff Act of 1930 included in the Trade Facilitation and Trade Enforcement Act of 2015.
Shipments valued at $800 or less for the de minimis exemption will be eligible under the same processes and with the same restrictions that currently apply to de minimis shipments of $200 or less."
https://www.cbp.gov/newsroom/national-media-release/de-minimis-value-increases-800
I placed an order with sneakAvenue. Still gonna try for one more pair from NDC when 10am rolls around.