Hyper Flea Market!

The city of Shenzhen is a real world centre for the production of electronic appliances and has a huge electronic components marketplace. There you can find all grouped together the passive components — resistors, inductors, and capacitors — together with crystal oscillators and certain cheap discrete semiconductors like triacs, transistor, LEDs, and so on, along with mechanical components like potentiometers, push-buttons, switches, etc., and spacers, washers and screws.