SAN FRANCISCO, Dec. 22, 2016 -- Cardpool, Inc., a leading gift card exchange company owned by Blackhawk Network, today announced tips to help consumers continue to have a positive experience when buying and selling using the secondary gift card exchange market. Through Cardpool, consumers can buy gift cards for up to 35 percent off and sell gift cards for up to 92 percent of their value. Cardpool helps consumers get exactly what they want, whether it's a discounted gift card, a different gift card, or simply cash.