I am a retailer and I deal in some used, discontinued and refurbished goods.
Box is open should be a 10-15% discount if it is in flawless condition. With a blemish...well it depends on the blemish. If it is on the faceplate and is highly noticeable, at least an extra 25%. If it is on the back or the bottom, I would give 5%.
Discontinued has a different impact. Recently discontinued on a sought after item will drive prices up. Think Oppo after it discontinued their disc players. Discontinued on a dog that was collecting dust...another 10-30%.
Box is open should be a 10-15% discount if it is in flawless condition. With a blemish...well it depends on the blemish. If it is on the faceplate and is highly noticeable, at least an extra 25%. If it is on the back or the bottom, I would give 5%.
Discontinued has a different impact. Recently discontinued on a sought after item will drive prices up. Think Oppo after it discontinued their disc players. Discontinued on a dog that was collecting dust...another 10-30%.