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DLCs always go on sale along with the base game. At sale game is usually around 7.50 and DLCs are usually 50% off, so around 6 bucks or so. Idk if Steam ever puts them in a bundle specifically with an extra bit off, but either way on a sale the whole thing is pretty cheap to just by piece by piece. Always check the Paradox site's store too, sometimes they go up to 75% off there and it gives you a Steam key.