Hi there,
Sorry to hear about your insurance. Seems to be the case with many people. I am unable to use insurance so I will be traveling to Mexico for my surgery. I am using Dr. Carlos Altamirano through BariatricPal. Honestly, the best thing you can do is go into the FB support groups for these doctors (choose a few) and just read & soak in all the information from post sleevers. You will learn so much and it will help you with your journey. His FB page is "Dr Carlos Altamirano Support Group".
I know that if you put $500 down, it will freeze that price for a year. There are also a few finance companies they can also refer you to. Good luck with your journey!