To celebrate Easter, GameStop is offering a buy two, get one free deal this weekend on all of its used games priced under $20.

The promotion has already begun and runs through the weekend, ending on Sunday, April 20. GameStop notes it's recently dropped the price of many of its used Xbox 360 and PlayStation 3 games to $20 or less, making them eligible for this deal. A number of Wii U games are included, but no Xbox One or PlayStation 4 games fall under the $20 mark.

Among the games you'll be able to pick up with this deal are Halo 4 ($13), Uncharted 2: Among Thieves ($7), Fallout 3: Game of the Year Edition ($19 on the PS3, $13 on the 360), Metal Gear Rising: Revengeance ($18 on the PS3 and 360), Red Dead Redemption ($10 on the PS3 and 360), ZombiU ($20), and Call of Duty: Modern Warfare 3 ($7 on the PS3, $10 on the 360).

While PC games are exempt from a preowned deal, Origin is currently holding a big sale on many of its digital PC games, including Battlefield 4 and Titanfall.