Normal, the lfs in HK usually does not accept reservation even with full payment. Don't bother to bargain with them on the prices as their prices are pretty much firmed as well.
Lemon, try to see what rare fish you can find on this trip. Both my trips are pretty fruitful.
1st trip I saw: Interruptus angel, small blue lines, flame wrasse(they are rare in singapore few years back), peppermint hog(they are pretty rare last time as well), crosshatch trigger
2nd trip I saw: Psedanthias ventralis hawaiiensis, mitratus butterfly, small bandits, tinkerii, small conspics