How to check if a game is a bunlde game or not?

On the old website I recall it telling you what games were bundled or not, is there a way to check that here? I was going to buy the Magicka Collection and give it away but I don't want to spend money on a game many people might have already gotten in a bundle.

Only 4/13 of my giveaways were non-bundled when I gave them so I was looking to even that out a bit. Any help is appreciated =)