What can you do when you run out of money before your product is built? Take your unfinished product to market. Business is fundamentally about getting customers a lot more than it is about building products.
I would presume that your half finished product was being built to solve a real problem? You need to go out there and find a few people who are really badly going through the pain of the problem you propose to solve with your half finished product. Show them how it works now and what it would do when finished and ask if they would be willing to place an order if you could deliver the product. In fact, could you get them to give you a purchase order? Even better.

If you can get that far, getting the finance for your business will not be that hard anymore.