Craft beer in general, is just getting started in China. I travel to Shanghai several times a year on business, and have never seen a store for homebrewers. There is beer made in the back rooms of some restaurants, but it wouldn't qualify as craft beer.
There are a couple of good breweries that I visit, and they have told me that it has been difficult to get ingredients, and is only beginning to get a little better. Domestic grain and hops are inconsistent at best, and imported grain is expensive. I take hops and dry yeast with me for a fellow homebrewer, because he has trouble getting them.
Of course, hardware is cheap and easy to come by.
I haven't been to Shenzhen, but if there is a micro brewery there, tell them to get to know the brewer. Small quantities of ingredients, domestic or imported, are hard to get and the local micro brewery or brewpub may be the only way to get them.