Hong Kong can buy a lot of foreign's things, actually!
But I tried some in America that can't buy in HK:
-Lindor(chocolate) : 產地 America and the price are around US$3.75 = HK$26.25
-Reese(chocolate): 產地 America and the price are around US$2 = HK$14
I suggest you to buy Reese because Lindor is one type of Lindt, so I think HK can buy it for not very long time away.
I love Reese chocolate milk cup, but it is peanut butter inside the cup.