Sell gift cards securely from City Blue with Raise's online gift card marketplace. Your City Blue gift card will be listed in front of the thousands of buyers perusing our gift card exchange. To sell City Blue gift cards quickly, set the price between 2% and 20% off the original amount. The asking price is up to you, but it really depends on the popularity of City Blue gift cards. Remember, you can adjust the selling price of your gift card at any time.