I can't believe this stuff is available in my state!
You can buy OC/Pepper Spray in all States.
A couple of States have a few laws about how much you can carry, and in Mass you need a license. But yeah, you can get the stuff anywhere in the US.
Would it be legal to sell a capsaicin extract in places where pepper spray is illegal? - Just in a normal bottle not a spray bottle
From what I can find, Oleoresin Capsicum can be sold anywhere in the US. Pepper Spray usually isn't just 100% OC.
Nobody really cares about Pepper Spray in the US. You're more likely to get in trouble with your EDC knife.