There is an import food chain store called "City Shop" that sells a lot of foreign items (some are organic) but they also have a ton of organic vegetables. And they will deliver to your house if you order online.

Check it out here:

http://www.cityshop.com.cn/webapp/wcs/stores/servlet/TopCategories1_1060...

There is usually more organic stuff in the stores themselves - the fresh veggies section of the website is a bit slim, but they actually have more.

There are several organic farms in the suburbs that will deliver to your home.

http://www.shorganic.com/farm%20intro_en.html

http://www.biofarm.cn/en/index2.html