Anyone know where I can get a low cost Endoscopy?

I have a very bad case of G.E.R.D that has me waking up most nights coughing and vomiting. I saw a Gastroenterologists and he would like to perform an endoscopy to find out what is causing it. The problem is that even with my insurance, I’m being quoted over $2000. Are there any other lower cost options around Houston I could use?