Electronics can be found in many different places - but it's more likely to find electro-gear in big cities in affluent countries.
A good rule of thumb for found electronics in general is that if the cord has been cut, then the device is non-functional (it's sort of a code from the person who knows it's broken to anyone else that might be interested). This is also a good mantra when throwing things away. Of course, if you know enough about electronics repair, anything can be fixed, but don't expect something you find with its cord cut to be completely functional when you plug it in.
Even if the cord is cut, if you are into electronics, you can still find lots of reusable parts. Plugs, connectors, fuses, motors, buttons, LEDs, potentiometers, displays of all sorts and so on. Especially stuff made before the 1980s can be good - partly because components on circuit boards for electronic devices from that period were mostly through-hole (and not surface-mount) and thus the parts are easier to remove. Even if there is no useful parts which you may reuse or resell or whatever Re, you may also cut/pull/smash/drill/break-out some copper or any other metal out of old (dysfunctional) electronic equipment. If you search for a scrap metal shops in your area you may found some of them are willing to buy copper from you for a quite reasonable price, and some of them even in SMALL quantities (usually more than 1 kilo). In that way you can earn some money out of rubbish which is meant to be thrown away.
Recycling electronics for cash
The website scrapmetalforum.com is a great website for learning what parts of electronics can be recycled, although you'll have to go to other sites to find buyers outside of the US.