Compared to Bunnings (~$20-$30 per stone/hone) I think this represents good value.
I got mine last week from Amazon AU, just checked and the listing now ships from US. Perfect for destroying your secateurs in a botched sharpening attempt.
Or if you know what you're doing I suppose you could buy them too.
Set of 4 https://www.amazon.com.au/EZE-LAP-PAK4-Color-Coded-Diamond/d…
and set of 5 https://www.amazon.com.au/EZE-LAP-PAK5-Color-Coded-Diamond/d…
also available @ ~$11 per hone.
Better to put that money towards a fixed angle sharpening system. Costs more, but quickly paid in itself by extending the lives of all the knives and scissors around the house. Plus not have to replace botched jobs lol