(b) The contract services are furnished at prices that are, or are based on, established catalog or market prices. An “established catalog price” is a price included in a catalog, price list, schedule, or other form that is regularly maintained by the manufacturer or the Contractor, is either published or otherwise available for inspection by customers, and states prices at which sales currently, or were last, made to a significant number of buyers constituting the general public. An “established market price” is a current price, established in the usual course of ordinary and usual trade between buyers and sellers free to bargain, which can be substantiated from sources independent of the manufacturer or Contractor.