Retail price at time of its purchase. But if you wish, in the description feel free to state for what they currently retail. Otherwise you are just being deceiptful. You should not lie or deceive.
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?