Looking to buy Rhino 6 - 7

Hello, I am looking for Rhino 6 / 7 second hand. If somebody wants to transfer the licence, lets chat and make a deal.

I want older cheaper licence just for transfering dwg files to 3D and back.

careful that older rhino versions may not be able to open newer dwgs.

Yes I am well aware of all cons of older versions of Rhino.