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I don't know what price you're used to paying in the US, but there are many shops called BC Fitness and Wellness. Here is a link to their website that has the list off all their stores, locations and opening hours. It also has a list of all their products and anything else you need to know about them.
http://www.bcshop.hk/en/our-shops.html
Quoted from the 'About Us' section of the website, it also says, "Our products are imported directly from the USA, Canada and Europe on a regular basis, including multiple brands, and always ensuring the freshest products available". Which also answers the question of being made/sold/imported from the USA.