I'd like to know if after a standard apocalypse [societal collapse, looting and all that], it would be possible to acquire poisons such as batrachotoxin, tetradotoxin, or maitotoxin. I'd also like to know if there are any other substances that would work better for my purposes.
I'm looking for naturally occurring substances, as the character wishes to be able to:
Only use natural toxins
Have the target incapable of movement soon after delivery of dose [dose does not have to kill that quickly, as long as it does in the end]
Large quantities means that the character will be able to have upwards of 20 deliverable lethal doses on hand
There should not be a need for synthesis or other lab equipment to manufacture the toxins
Delivery method is tipping something pointed [a needle/dart] with it
Person affected should not be able to react/get away within the first couple minutes of injection