If you email Kodak your digital photos, they'll return prints on paper. Arthur Andersen doesn't market a product at all, whether atoms or bits. You buy the consulting services of its employees. You buy a Gateway PC directly from the company. You buy Nike sneakers indirectly from Dick's .
Delta distributes tickets for their own flights.
When you book the same flight at Expedia and ask for a paper ticket, it will come in an Expedia envelope. The charge to your credit card is to Delta Air. If the paper ticket doesn't come in time, you call Expedia, not Delta. EBay and Onsale are traditional auction sites, where buyers compete, driving up the price. As William Shatner is pleased to tell you, name your price and the sellers will match it.