How to Find Bundles on Steam?

Every so often I stumble upon a bundle/pack/collection deal on Steam, which is as a result of coincidence when searching for other games.
Last year I wanted to purchase a specific Sonic title, but found a massive collection of Sonic titles on sale via this collection: Sonic Collection, which is now at $112.99, but at the time of the sale was an amazing $29,99.

Recently again, I stumbled upon another collection of games, this time from Eidos, Eidos Anthology. This prompted me to try do a number of different searches to view bundles on Steam, add them to my wishlist and wait for the sale, which would result in a massive sale, as with the Sonic Collection. But my attempts were mostly useless as it turns out, THIS being the closest I've come to achieving my goal.

Does anyone know if there's a category for such bundles, which can be searched on Steam, or some way for me to be able to track bundles? It's frustrating that they exist within the database, but are not as easily accessible by means of a search as with normal titles.

Thanks in advance for the responses...perhaps I'm just being a noob here. :)

Edit: Forgot to mention that you can't add these bundles/packs/collections to your wishlist hoping for a sale notification.