Thanks, YVR Cockroach.
I've added another section at the end of the OP for non-airport 'best finds', with a link to your find.
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The SYD duty free brochure has a 20% off offer on Ballantynes 'Very Old' whisky range.
Here is the special, including the 20% discount off normal pricing, AUD$
Ballantynes 17YO $73
Ballantynes 21YO $119
Ballantynes 30YO $376