How to buy cheap windows assembler?

Question

Windows

I am an employee of a small company whose task at the moment is to install about forty computers per "candle" factory) - these computers should have Windows 10 installed.
Can you tell me the cheapest way to purchase such a large number of (oem?) Windows 10 licenses Pro?
Until today, I used the option of envelopes with an OEM version for assemblers, which comes out at 10,000 ₽.

Answer 1

40 is a small amount, you won't get any significant discount legally.

Answer 2

Buy immediately with hardware from an OEM - the cheapest.
It's like 4,000 or so.