Eastshore.xyz is reputable and they mark most items with a value of $90; they ship from China but they have low prices on certain miners and they're good with shipping. Just watch out for FedEx fees and such, they are usually more than customs if any. Their prices for the Ebit E9 are nice, and those miners are good and relatively efficient. Just note the GUI is in mostly Chinese, you should be able to set it up without translating if you do choose to buy it though.
How are the customs calculated?
Through values, Eastshore labels all miners as $90 value and they usually get through with no issue or only a small fee. Pretty sure some shipping services like FedEx will charge fees on delivery for things like brokerage or something like that if fees are incurred, sometimes not. Haven't bought direct in a while so I'm not the clearest on these customs things.