We've added support for Steam bundles - i.e., packages with URLs starting with " https://store.steampowered.com/bundle/..."
If you still see any missing bundles, it is most likely because we haven't finished matching the Steam products with our game cards. We should complete this process within a day or two.
PS: We're also working hard on bringing back the Humble Store offers. It shouldn't be too long before we include Humble prices again.