Every PC gamer loves a Steam sale, however picking up deals can get a little trickier when you already own half of the games. It's a first world problem for sure, but it gets frustrating when you find a brilliantly discounted Steam bundle, only to realise that you'll be paying for some duplicates. Now, Valve will automatically reduce the combined price based on the games you already own. I have Half-Life 2, for instance, and can see it scratched out in the Half-Life Complete set. Some bundles remain unchanged, however, so the feature could be a gradual roll-out.