I use the Goodwin multiplier if the words illustrious, POP and PSA are used in the same sentence. Enter the normal non-tough price into any scientific calculator then start randomly pressing all the symbol buttons for a period of 10 mins. Then multiply that number by 20 after 10mins and there is your new back selling price.
http://www.goodwinandco.com/LotDetai...Chart%e2%80%9d!