Most doctors in the US won't quote a concrete price, although it is becoming more common.  Packages are available at some bariatric centers, both here and outside of the country.  For VSG surgery, the very experienced and competent doctor I went to in Mexico was charging a flat $10,000 for two nights in hotels (before and after) and two nights in the hospital after surgery, $10,500 for BMIs above 50.  The VSG give comparable results to the "bypass" (technically the RNY), but is less invasive and has fewer problems with vitamin and mineral absorption in the future.