Visited twice at one of the mall selling the electronics equipment. The most item that I sought are GPS.
The place is called the Gangding Business Zone. Gangding Business Zone of Tianhe District is very famous in computer and IT (Information Technology) industries. Actually, Gangding is the extension of the Tianhe Business Center. With the Pacific Computer City, Galaxy Computer Plaza and other commercial units won great success business in this area, Gangding became a unique business center dealing with computer and IT products.
that info are from .. http://www.excelguangzhou.com/gangding-business-zone.html
One of the mall is Pacific Computer Mall. A multi storey building selling mobile phones, GPS, and other related electronics products.
Price wise? Consider cheap, for me the GPS are really cheap!.
More details can be read here .. http://www.guangzhoutravelguide.com/guangzhou_shopping/guangzhou-pacific-computer-city.html
image from http://www.guangzhoutravelguide.com/wp-content/uploads/2010/11/computer-city-B.jpg
to reach here take Metro Line 3 and get off at the Shipaiqiao or Gangding station.
Beside Pacific Computer mall, there are other mall nearby, thus, if you cannot find what you want from one mall, just go to the next mall, and next mall,,, :)