What does a sleeve gastrectomy cost?

I know I'm a candidate for something drastic like a sleeve gastrectomy and am prepared to do whatever I can to have one. My understanding is that they are pretty expensive but am wondering if any health insurance plans would cover it. At my age [43] I know that my health is very vulnerable at my present weight and how a stroke or heart attack could happen any time so insurance should pay for it, but if they don't, how much does something like this cost?