Chief Securities currently have a good offer if you're buy and hold type.
Sign up for their Monthly Investment plan for either HK and/or US stocks and get 24 months free brokerage fee. They offer certain companies that HSBC don't on their SMIP, like Baba and Xiaomi, but the choice for US stocks is limited to a selection of about 30 blue chips and ETFs.
Their transfer out fees aren't outrageous, and your HK assets are protected up to 150k or whatever it is, so you could take advantage of the offer and then transfer out to your bank having saved 24 x 130hkd/18 usd - the transfer out fees (think it's 40hkd and 50usd per stock respectively).
Do all your own research in advance. Apologies if any of those numbers are incorrect. I started using them this month and have been happy so far.