Lol. I had to fight my insurance for about six months through several levels of appeals to get them to pay for it for off label use. And it costs, IIRC, $700 a month out of pocket.
You started with the premises that there was a legitimate way to fill my prescription cheaper.
And, no, buying from an unregulated pharmacy was never "worth it" to me, that's why I didn't do it even though it was an option.