I was looking into DHL recently.
Apparently they charge $15 on top of tax and high shipping prices. I can't tell if there are circumstances where they charge more than that.
While this information is useless during the lockdown, apparently you can avoid the $15 by properly filing the customs paperwork. Your mileage may vary. (I would suspect they're very strict on the paperwork. Maybe just printing off the receipt from an online order would cause problems. I don't know.)
https://borderbee.com/2014/01/13/how...-with-customs/
and don't bother with their linked alternative broker. They wanted to charge $64 fees + $4 tax for an $80 item.