Living in Canberra, I've been looking for air purifiers…
Lots of items are on sale at the QANTAS shopping site, and if you drop the points down to maximum $$$ value, it's actually really good.
The Dyson Pure Cool is 84,490 points (eq $850ish). But drop it to $525.21 + 2000 pts, and it's around $570 with free delivery.
There's a bunch of other things too