Oh prescription for GHB (aka Xyrem) is being prescribed left and right considering its maker Jazz Pharmaceuticals has some expensive stock price (which means they are profiting from a niche product).
Speaking of GHB, I've got a friend with narcolepsy that gets a prescription for sodium oxybate (γ-Hydroxybutryic acid, or GHB). He loves to share it with me about as much as I love to ask him to.
It ain't an easy 'script to acquire. But if you learn about narcolepsy and improve your acting ability, you shouldn't find it terribly troublesome getting it.