Hi Joe

The best thing you can do is approach the businesses you are building it for. If what you have created is 80% of the way there and you are clear about what needs to happen to finish it, at least one of them might want to throw in a few bucks (and some time and effort) to help you finish it. But the first step is to reach out to the 20 or so businesses that you have identified as your first likely customers.

I hope this helps.

Cheers
Matt