I recently bought 16 more Hiks from two different sellers on AliExpress (8 each). One shipped DHL, the other FedEx. Both agreed to ship express for free because of the size of the orders. Both recommended valuing the cameras at less than $200 total so there wouldn't be any additional charges from the courier. I agreed, that's how they valued them, and the commercial invoice on both packages reflected a $20/camera charge. Both orders arrived within 2 days of shipping, 5 days from ordering. No issues with customs, and if what they say is true, i shouldn't receive any additional bills.
I did get a $30 charge from DHL a year or so ago, when I bought 8 cameras. The seller marked them as $400, FWIW.