Unfortunately, you can’t anymore.

These were very limited time free items to promote an upcoming episode of the Simpsons and were only available for a week or so. They can’t even be bought with donuts.

The lesson is to log on to Tapped Out regularly, particularly on a Thursday or Friday just before a new episode in the US. The items and characters seem to come with no warning – but whenever the game updates it’s a good idea to spend some time looking around your town and check what’s in your inventory. All of these items were introduced into the game by a conversation between characters, so don’t click through these – stop and see what they are saying.