What is the purpose of these? Is it a promotional aid? e.g. they expected to sell at $50, so they price to $75, then give away effectively enough "coupons", such that their sale price is $50? Or, are they really giving something back to the early orders - is it possible to get a Cash Alternative? Or, say use 3 coupons, such to get a free chip?
They tried to sell at $90 and couldn't. Then they tried to sell at $75. Then they added the coupon discount.
At $50, the economics are better but still pretty grim with 100 days of difficulty growth before the chips are delivered. Then a week or two for the boards to be populated and shipped.
I think you can only use 1 coupon per 1 chip.