Ecost was mentioned as a place to buy refurb's. Any other refurb places to buy the Denon 2805?

Lorenzo1000, please excuse my ignorance but why would the Denon AVR-985s be exactly the same as the 2805? I have heard of different companies purchasing the same product and putting their company stamp on it and selling it as their own (ie, certain projectors), however, why would Denon sell the same product under two separate product numbers?