Xiaomi Air Purifier 1/2/2S/Pro Replacement Filter $17.59 US (~$26.04 AU) Delivered @ Banggood
Good price on a replacement filter for OzBargain's favourite Xiaomi Mi Air Purifier. This is an unbranded version of the "Economic Filter" that comes included with the Air Purifiers and it's identical in every way except for the branding.
Next cheapest is the generics from eBay China/HK sellers with prices starting from $29.12. The advantage of Banggood is that cashback usually pays out on coupons so you may get it even cheaper.
- Select option B and apply the coupon BGAF20 at checkout
Remember to untick shipping insurance. GST included and AU$ based on current exchange rate.