I dunno,
How many stores sell Gold plated Iphones? Or how about asbestos oven mitts, overalls, and insulation?
Availability reflects just how easy something is to get. Things with a high availability are that way because they don't make a lot of them, there are laws that prevent their sale (need a license), or people don't want: Like Nanotech after the CFD scare. Not to mention that many items made by nanotech also turned into huge piles of goo, causing many deaths also has a factor in that too... See Storm Front.