When it comes to the trading of cards, this is what we do and how we go about conducting trades to the store. We look at condition of the card(s) you are wanting to trade in, value of the card(s) and turnover rate.
When determining prices we go buy TCGPlayer Market Value
If you are just wanting cash we do 50% of market value.
In-Store credit we do 50% as well unless other wise noted.
If you are wanting other cards in store we will do 75% of market value.