I have gotten it from my Neuro but my ins company is very strict on how much they will pay for a month's worth (2 bottles in my case -thanks to my HMO). They are really stingy and you lose some with the priming of the pump and sometimes the spray doesn't come out the way it should, I have addressed this with my Neuro and he agree's. I have paid full price at Walgreen's just to get the relief. The OP's that offer it are high in price so that's why I just wait to get it from my Neuro.
I have seen prices for $235 a 2.5ml bottle v. me paying full price of $82 at Walgreens v. paying $7 a bottle with my insurance.