I think you should do an extensive search. Here, I mean you have to check the available vendors locally. You can inquire from other food distributors and they may provide you with lead information on where to get vendors for coconut. It doesn't matter they are in the same line but mostly focus on the food industry. Also, use social media and you will be surprised from the suggestions you are going to get.
Another approach is to start marketing your business however young and it will be easy for you to start linking with distributors. When starting up things may overwhelm you but connecting one link with another will open up doors for you. In fact, you will get more calls than anticipated.