https://steamdb.info/sales/?displayOnly=OwnedGamesDLC only for those in sales though
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You can try this site.
It needs some preparation but after that it is an conveniant way to see which DLC´s for owned games you are still missing.
https://www.steamprices.com/de/user/ownedgames?dlc
I got to this site with basically the same question that you have right now.
And it coveres what you ask for in every aspect
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Is there any option to check what DLCs (for games you already own, that you don't have yet) have discount without having to check each store page or adding them to the wishlist. I was under the impression that you could that on steam but I honestly can't remember.
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