New quote from PCB manufacturer.
PCB unit price: USD 1.8
Tooling and testing: USD 300

This prices are for the size of this project.
So, that will leave us a discount on the hardware price of  $6900.

Price per chip assembled right now is +/- 6$USD
Price per GH/s right now is +/- 25$USD or 0.3623BTC with Klondike blueprint. Still waiting the sources for the BitBurnerXX to make a quotation.