SimGuruSarah has commented on this mystery.
Time for the craziness to begin. EA has removed several free sets and items from The Sims 3 Store. For now, you can still re-download them from your purchase history if you’ve done so before. My favorite free Store items removed? EVERY CAR!!! No more Fords or Toyota’s for your Sims if you wanted to get them but put it off for another day. Oh no, you are currently out of luck. Oh and the free holiday items are gone as well. Free holiday items removed with a little over a month until Seasons is released? Conspiracy? Perhaps. Anyways there’s still some free items in the store, but not many.