[baybal2]

I'd say nowhere. Contract manufacturing has been a declining industry since its peak 10 years ago. The fewer small factories there are, the less refuse goes to street market.

You best bet is to go to the few remaining factory districts in Shajing, north to the airport and look what garage factories are selling. Also try going to districts north to S3 if you are a try-hard. Stuff there is mostly generic light industry goods, and not electronics per se.

It may worth going further north to Dongguan, but I myself rarely ventured there.

[contingencies]

People order on Taobao now, so physical presence in a market is of dubious utility for many factories. The factories are mostly in Dongguan where they have their own component markets. The Baoshan area east and north of the airport also has industrial components markets (more process-line stuff). Huaqiangbei (HQB) is mostly consumer electronics with some components. There's more in Longhua / Longgang, northeast of town. China Post is super cheap for bulk shipping if you choose surface (ie. sea freight) but it takes three months.