Be prepared to owe some $.  Im waiting for 2 L3+,  Seems like if the value is over $2500, they will want fees.  For 2 L3+ it was only $36.   I got a phone call from customs wanting tax id or ssn.  I got the tracking numbers from them before i got them from bitmain.  i think the UPS app will also let you know that you owe import fees.  You can pay online, I think they take credit cards and paypal.  Didnt notice if there were other payment methods.  I think they also offered COD to the driver.