Ask HN: Interesting electronics stores in Hong Kong/Shenzhen

Hi Hacker News,

I'll be in Hong Kong and Shenzhen for a couple of days and I'd like some opinions on which local electronics stores are fun or interesting. I last visited Hong Kong in early 2007, and while I was there I checked out the Mong Kok Computer Centre and the Golden Computer Arcade. There are several others, but do they offer anything that the other two don't?

I'm particularly interested in recommendations for Shenzhen. I know from reading Andrew "bunnie" Huang's blog that it's full of stores that sell mass-produced electronic components over-the-counter in small quantities: that's the kind of thing I'm looking for.

Also, if you know of any interesting gadgets or devices in particular I should look for, I'd love to hear about those, too.

Thanks!