GameStop: Buy 3 Select Pre-Owned Games, Get 1 Game of Equal/Lesser Value for Free

1. Add a quantity of 4 eligible pre-owned games to cart
Examples
* Fire Emblem: Three Houses (Nintendo Switch) $27.99
* Mario Tennis Aces (Nintendo Switch) $27.99
* Mario and Sonic at the Olympic Games Tokyo 2020 (Nintendo Switch) $27.99
* Yoshi's Crafted World (Nintendo Switch) $27.99
* Many More
2. A Buy 3 Games, Get 1 Free discount will apply automatically to one title of equal or lesser value.