Free Estate Cash

You  earn 1 Estate Cash when you level up, and you can find some in the crates hidden on unexplored areas of your estate. It doesn't give you that much, BUT did you know by completing surveys or other Zynga approved 3rd party partner offers you can get "free" estate cash?

Just click on the "Earn Coins & Cash" at the top of your game to bring up the dialog box.  Clicking on the Categories will sort the list out for you.  I've gotten estate cash from just filling out questionnaires, and if you are planning to buy something from these companies you might consider doing it through this dialog box and earn estate cash at the same time.

These offers vary regionally and are updated occasionally so it might be worth a check every now and then. :)