The phrase 'junk dealers' has different connotations depending upon the context in which it used. In this instance, a junk dealer refers to junk/salvage yards. These are sometimes referred to simply as 'the dump.' These are places people and companies go to drop off all different types of garbage. Many junk dealers provide recycling services as well. However, these spots are not merely drop off points. They often resell some of the things they collect. Most of the time, they resell auto parts, consumer electronics, and other items such as books, scrap metal, vegetable oil, and copper to name a few. If you want to save some money and have a certain degree of knowledge about the items you're looking to buy, junk dealers can be veritable goldmines. Mechanics and other auto enthusiasts visit their local junk dealers regularly to hunt for salvageable car parts and tools. Construction companies also frequent junk yards because they can find some of the materials they need for ridiculously low prices. Techies are another group that relies on local junk dealers for spare computer parts to refurbish. You may not know this, but there are some cars that run primarily on vegetable oil. Their owners flock to local junk dealers because restaurants typically dispose of their used cooking oil at these places. Naturally, people trying to earn some extra cash bring their recyclables to junk yards because there are certain items that your local supermarket isn't equipped to process.