This is implemented in the latest release. We also added sorting by Arbitrage rate. Details below.
Sometimes you can sell a gift card for more than what it costs, and you don’t want to miss such arbitrage opportunities.
For example, on a hypothetical day, Target gift cards are listed with 10% off, while SaveYa is buying them at 94% of face value. By buying low and selling high, you can make $4 ($100 * 94% - $100 * (1 - 10%)) on every $100 Target gift card.
In order to conveniently find such cases, we enhanced the website to support sort gift cards by their arbitrage rate, which is defined as
arbitrage_rate = sell_rate / (1 - buy_discount)