Hello, where are you shipping from?
Are you a tax registered company, meaning if you can supply an invoice declaring the EU VAT?
Or do you have the accompanying documents from your customs or tax department showing proof, that the tax has been paid?
How long is the 1 Antminer S9 unit running?
If near Czech Republic boarder, could come in person and pay you in cash.
My situation is evolving and will let you know during next week, I have a client for nearly 70 units S9 more.

Thanks, Jan