I needed a replacement for the ones I bought from this previous deal.
Even though the old deal expired a long time ago, the discount code was automatically applied to my cart and it is still working. They're currently marked down to $19.99, so with the additional 60% off they're down to $7.99 each. Ours have lasted between 12 and 24 months so far.
Postage to Gold Coast was $10.
Shipping to Syd metro only $8