Update: Cards Against Humanity, LLC offers its new Cards Against Humanity Holiday Pack for whatever you want to pay. If you opt to get the pack for free, you'll get a stern scolding, but it'll eventually let you place an order. (They suggest paying $5.) That's the best deal we've seen for a Cards Against Humanity expansion pack.
Warning: The video includes some harsh language, but you can pause it and begin the ordering process, thus bypassing it entirely.