Being that you are in NYC I don't think $750 is totally outrageous. It stinks you have to pay out of pocket - perhaps they will give you a cash discount?
We paid $18,000 for my daughter's colonoscopy/endoscopy at a hospital in Beverly Hills and I was told by the billing person that we were paying higher costs because of the location and the size of the facility! I wish I knew that before the procedure was done!