Umm yep near enuf to half the price, about 80% - 90% cheaper from memory, but that's here paying tourist prices for the K&N, I bought the Redline up North near Townsville, I can't speak for other places.
Although the K&N recharge kit was bought here and was near the full cost of the Redline filter alone.
The oil used looks very similar to ATF fluid, heh in bike terms I always used K&N but Redline don't make em for bikes, the K&N always worked well in competition on and off road bikes fully covered in dirt and mud they still were good.
I ain't knocking the K&N filter as such, just stating a fact that they aren't cheap "here" for the commodore type.
The bike K&N filters were washed in fuel, and rinsed in premix fuel with a dash more oil bout 20:1 that's tossed out anyway or put in the mower, racing fuel makes a victa scream through the grass, the fuel evaporates off the filter and leaves an oily film, works every time.