GameStop has added both Assassin's Creed 4 and Batman: Arkham Origins to its trade-in promotion, which has already offered GTA 5, FIFA 14 and Battlefield 4.

Trade in two different games from a specified list and you'll be eligible to get Assassin's Creed 4 for £9.97, or Batman: Arkham Origins for £5.97.

The list of games is extensive, but sadly many of the cheap to obtain games found in the earlier GTA 5 deal seem to have been removed.

Still, if you happen to own any of the games in the list you may end up with cheap copies of two of the year's biggest games.