I'm curious as to why you want them- just being nosy obviously.
I have a baton, but not collapsible- however it conceals a big fk-off blade.
Amazingly, I bought it in the car park of my local KanIm office.
3 metres from the main entrance door.
I cannot say where you will find what you want but if it is for personal security/peace of mind I am sure there are lots of options out there... just not in the places you may expect them to be.