Thanks to the eagle eye enthusiasts at OZ Formers who alerted the community to Robot Kingdom's 'retail' price Superion appendage sets. RK is now selling these sets for approximately US$60 per set, a very good price even be HK standards. After scouring the shops here for a month, I have concluded the the prices for the appendage set ranges from HKD$800 to HKD$1200 (US$103-155). US$60 per set is massively cheap. Needless to say, my slight interest in this set became a real interest since the deal was so good.
I ordered the set from RK before going out for lunch. Told E the good news during lunch and she said, what about the pieces that make up the body? Why don't we get those too? Told her I knew a place that has it and so we went there after lunch, and guess what, bought the Classics Superion giftset MISB for HKD$398 (US$51.26; AU$52.27).