Depends how you are defining junk. If you're talking about consumer goods that people want to give away, you should try freecycle. If you Google it you should find one in your area.
The best way to sell an old junk car for parts is to take it to a salvage yard or companies that offer to buy junk cars. Some good companies to consider are Pick-n-Pull and Junk Car Kings.
Edmonton, located in Alberta, Canada, has various companies that will purchase one's junk car for cash. Edmonton Junk Car Removal is one such company.
put an ad in: gunboards.com buy/sell board
The places to purchase moose antlers are many and varied. The best place would be a junk shop. Be aware, in some countries you might find that that it is illegal.
I know I can sell this junk at the swap meet!
One may find information on what is the best way to sell a car by using the guides at Edmunds. They have good information for safety, legal requirements and marketing strategies.
It is possible to find a BMW exhaust system but since that it a little more expensive car that has custom part it will be more difficult to find. It will be hit or miss on whether you will be able to find one in the junk yard or not.
get the junk put it together makesure it will stay an sell or depends on what you have
Sell Your Junk , Karville recognizes the common predicament of having an old, non-functional vehicle occupying space in your driveway.
When you sell your junk car for cash, you should sign over the Title (or pink slip) to the business to which you sell the car. That releases you from liability.
You can donate or sell your junk car to a local junk yard. All you have to do is call and they can pick it up for you and you have the option to donate or sell your car.
www.cars.com is a good place to find new and used vechicles. Another good site is, www.kellybluebook.com. Kellybluebook gives you the best price the cars can sell at and best prices to buy at, including what mileage is on the car!