I went in to Repco and got a $50 air filter. I was about to change my oil so I got a filter. The lady at the counter said 'the oil filter and oil special is only $20' (which is what I linked to). It was not quite the right grade oil, but I thought - ah old car, close enough. She scanned it in and it came up as a combo special for $34.95 the lot! Even she was surprised. Much cheaper than the air filter alone.
The filters were both repco banded. Oh and I showed my mum's RACV member card, not sure if that helped.
Anyway, I was very happy. I hope it works for you too. It may expire today or it might keep going.
How old?