The only retail price that is relevant is the current price. It matters what it would cost to buy a new one. It does not matter what the seller paid for it.
Retail?
When listing an item's new retail, should the price be the current retail, or the price of the item at the time it was purchased? If you know someone bought an item for $2,500, it is 3 years old, and the say the current price is $3,300 and are asking $2,200 - is this appropriate and honest or somewhat not?