If you want high quality ones I normally work out what size I want and order from an electronics company - like rs components or element14.
Otherwise try auto or marine places, like
https://www.carpartsclipsandfasteners.com.au/ or
https://wolfchestershop.com.au/body-clips/
If you want a kit of random stuff you're always taking a chance (on quality and on sizes etc you never find useful)
E: If you want the one you linked to did you know that amazon AU has them? Double the price but still cheaper than ordering from the USA
https://www.amazon.com.au/240-Pcs-Ki.../dp/B06XVC5H3K