How expensive is opsumit?

I'm curious to know, how expensive is opsumit? It's a medication that I've heard can be quite costly, but I'm hoping to get a better understanding of the financial aspect before making any decisions about my treatment options. Is opsumit covered by most health insurance plans? Are there any generic alternatives that may be more affordable? And, if I were to purchase opsumit without insurance, what would be the estimated cost per month? These are the questions that I have in mind as I explore my options.