It is not only fair but is good business pratice to sell ALL inventory
at current prices , NOS or not.

There is a factor in business accounting called......"Inventory Holding
Cost". Which is the cost to the business to let items set idle while all
other sales support the profit line. If there is a business loan to by
inventory ,which there often is, then the interest is part of the holding
cost also. Factor in inflation, devaluation of the dollar, lost profit and
you have a soup of loss that the business must cover to stay in business.

If the NOS were to be sold at MORE THAN the current price then that would
be gouging.