Order screenshot: https://imgur.com/a/W4g4zId
I am very confused how Amazon AU's math works. The deal price is AU$5.23, changed to AU$5.00 after added to cart, shows AU2.7 during checkout(AU$9.x including shipping). But if you go back to cart and increase the quantity, it actually gets cheaper, please see above screenshot showing 3 x 3 pairs at AU$8.10 including shipping.
Comply IEM eartips are very high rated but might not for everyone. I prefer silicon ones but at this price I just bought few and leave them in the drawer might be handy one day.
The model number(400) is the size of the center hole of the eartip, remember to check the diameter of your IEM or use Comply's "Find Your Perfect Fits" button on this page: https://www.complyfoam.com/pages/tip-size-guaranteed-fit
Prime membership required.
Didn't get the 3x3 price glitch, but it does appear that they get viewed as higher price items for shipping purposes so was able to add to an order that didn't qualify for free shipping.
Quite restrictive with the ones that this deal applies to, I only found 3 that were eligible.