Originally Posted by
STS-134
I didn't set foot in HK on my last trip. China Unicom HK will ship those SIM cards to international destinations, and they can also be bought on Amazon and from here
https://www.comnet-telecom.us/store/sim-cards.html if you are coming from the US (this is the link where I purchased the card, and it came with a nice $5 discount and free shipping too!).
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You link only mentions shipping in HK.