Where do I buy Rad-X?

[Haha pretty much lol]

I need to buy some Rad-X before going into the glow. Where can I find some?

[GeminiClone]

http://steamcommunity.com/sharedfiles/filedetails/?id=147606708#57103

The Hub:

Right next to Jacob's place is Vance, the proscribed substances dealer, specialising in all Chems: Rad-X, RadAway, Psycho, Super Stimpaks, etc. But, you need an introduction from someone before you're allowed to talk to Vance. This someone is a certain Lemmy, who hangs out on the street near the Maltese Falcon bar on the west side of Downtown... but it's gonna cost ya! I couldn't find any way to avoid paying Lemmy in order to get the valuable intro to Vance. He asks for 1000 Caps, but you can get away with 800 if you have high CH.