To get new items you need to go to research and conversion. Set daily founding. In a year you will have all items.

Once you get $999,999 you will no longer lose any money from puchase cost

In order to get everything easy, such as buildings, animals, and toys, when you begin with a new zoo, there is an option to raise the starting price up to $500,000 and set the Research and Conservation to $66 (the max) for daily funding.

Then you will feel as though everything is coming alot easier than when you start with $100,000.