Rushmere:
Buy a Numatic Henry.
They’re very simple, old technology, and might cost slightly over $500, but they work and they last for forever.
They’re available here from places like Godfreys, although they’re maybe not so well known in NZ. Back in the UK they’re legendary, and just about every commercial cleaner there uses them because they’re reliable.
Henry / Hetty are great. My wife bought one from the UK, it's probably 15 years old or more, still works great. They cost $530 at the moment, they'll last decades.
They sometimes start to smell after a few years - like most vacuums. Soak the pipes in the bath in floor cleaner or bleach for a year, in summer, then hose them out outside. Give the motor unit a wipe over too.