schema.org – Structured data: ItemAvailability value for Factory Direct articles (non-stored distribution)?

Does anyone know how to contact ItemAvailability in cases where the item can not be stored, but that the item is available directly from the manufacturer / factory? In other words, a company may sometimes offer a product only through authorized resellers, but prohibit any reseller or distributor from stocking the product. Thus, the retailers e-commerce website can not accurately say InStock or OutOfStock. Would OnlineOnly seem useless to the end user in this case?

Members of the enumeration

  • Abandoned
  • In stock
  • In store only
  • Limited availability
  • Online only
  • Out of stock
  • Preorder
  • presale
  • Exhausted