No matter how cheap or badly used the camera you own is…you can trade it in and get a $300 credit for the A7 or A7r purchase at Focuscamera (Click here) or BHphoto (Click here).
P.S.:
Free Case with Sony QX10 Lens-Style Camera Purchase at Amazon (Click here).
Free Case with Sony RX100 Series Digital Camera Purchase at Amazon US (Click here).