You do need to do a little research first and figure what you want, esp. with local shops doing specials etc.. I’ve always found that Champagne, perfumes and chocolates are rarely/never cheaper, or not enough to warrant the purchase. Found this in any airport anywhere. Also only found minimal discounts on the common spirits like JW-Red and JBeam.
But last trip from SYD I found Limoncello at less than half price, and Hendricks Gin at about half price but ONLY for the 1L size. Time before that found 50% vodka at SIN was half the d-free of MEL. So, a bit of research is well worth it.
Being able to iPhone/google in the store to confirm what you see on the day (in-store offers etc) is a real bonus.
On the down side, I normally do return p/up but last trip for the first time I got diverted to BNE then home, never got back to SYD and so missed out - couldn’t pick the gear up and they couldn’t mail it to me. They were prompt with a refund (I had all necessary doco) BUT their website was info-poor.
Lessons for next time
- be sure to take a phone-photo of the sale receipt, it’s needed to arrange the refund
- I’ll maybe buy again on the way in, knowing I won’t be able to p/up