I'm visiting Guangzhou for a few weeks with my fiancé, which has relatives here, and thought I'd pick up a nice and cheap goban when I'm here.

After a few days of shopping, I still haven't been able to track one down though.
I tried asking a few of her relatives if they had any idea on where to track one down, but they didn't know either.

Anyone been to Guangzhou, and know where I should look (or just to China in general, and able to provide me with some pointers?).

It would really be appreciated.

东湖棋院
http://www.dhqy.com

Some other places I found from Chinese websites
南岸路 文化体育用品市场
一德路 德宝文化用品市场

Hope it help you find something suitable.

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http://tchan001.wordpress.com
A blog on Asian go books, go sightings, and interesting tidbits
Go is such a beautiful game.

there are TONS of small stationery stores along the streets
the easiest way is to find elementary or middle schools, there must be stationery stores around them
I would say 90% of them sell Go sets
good luck!