"There have been a number of auction-like marketplaces, such as Plastic Jungle and Rackup, that have popped up to allow users can buy and sell their gift cards to each other..."
"...CardPool is entering the space but with a slightly different twist to its model. Card Pool allows users to both buy and sell gift cards."
"...CardPool is entering the space but with a slightly different twist to its model. Card Pool allows users to both buy and sell gift cards."
What is the twist?