Stores that sell HEPA Air Purifiers?

I’m looking for a air purifier that uses a HEPA filter, NOT an ionizer. I live in Perth, W.A. and can’t seem to find them anywhere. I’m talking about $50 ones by brands such as Hamilton Beach. They don’t sell them at Big W, Target or Retravision. I looked on a few online stores that ship to Australia but they only sell a few cheap Ionizers

Help anyone?