Have you checked ebay or talked to your local drone shop to see if there were any used units? In addition, there are a couple of things you may want to consider:
1. Do you need an Inspire for your proposed work, or will a P3 or P4 work?
2. Do you need more then the drone or will you need multiple batteries. In my case I have significantly more money in batteries.
3. Do you need to look at some funding for your new business? You may have to pay for drones, batteries, licence, insurance, cash flow between payments, etc..
Hope some of that helps and good luck in your new business!