In Australia you get 10% tax back, so my parents used to buy apple macs and iPhones. Also at Myers they were giving an additional AUD 100 back upon purchase of Apple product, but this was a year ago.
Also in Australia buy QV cream, lanolin cream, emu oil, lucas paw paw and of course vitamins. Vitamins are ALOT cheaper, jurlique, of course you can buy infant formula.
If you are a girl, buying bareminerals cosmetics is a lot cheaper in Australia as well. Baby clothing is also a lot cheaper and buying items from Target and Kmart is as good quality as the expensive brands in HK.
Sorry for kmart and target I am referring to kids clothing. Also Myer and DJs year end sales are good. My mum once bought a pair of TODs for only HKD 1200.
Not sure about steak, you check the HK customs website.
But for 防骨質疏鬆的 supplements, my Mum uses https://www.priceline.com.au/blackmores-glucosamine-sulfate-1500-180-tablets
Yes, because Australia does a BIG sale on Boxing day (26th Dec) in the city, David Jones has more luxury brands on sale. Boxing day sale like the thanksgiving sales in Sogo and thanksgiving sales in America.
Many top Australian and international brands go on sale! Also with lower AUD, go time to shop. My sister prefers going to David Jones as better value because they sell high end items and often better quality.