Wish I still had access to what it cost us to buy the medication, but I don't. I'm thinking that it was around $100 for the vial, but there are MANY doses in that little vial. (The exact number depends on the dosage your doctor gives you.) My husband's dose was originally 7 (ml? mcg? I forget....), and it's now 5. We use it about once every two weeks or so, and we're still on the same vial we've had since August. Our usage isn't too frequent, so if you'd be using it more frequently, obviously you'd go through it more quickly. But still --- it's not too bad $$-wise.
Neither Medicare nor health insurance covers this cost, even though my husband's need for it was a result of his surgery for cancer. That apparently isn't relevant to the insurance.
Good luck - hope that helps.