Sell Scrap Metal
If your backyard looks like a car cemetery, then consider scrapping some of that iron and brass for quick cash. Scrap yards and metal recyclers will pay by the pound for new, used or extremely used items made from ferrous materials like steel and iron, or less common non-ferrous metals like aluminum, brass and copper.
Copper is by far the most valuable scrap metal, selling for around $3 a pound, depending on your location [source: Scrap Monster]. The most common forms of copper are copper pipes and copper wire. Brass is another valuable scrap metal, selling for more than $2 a pound in most locations. Some older cars -- like the one that's been on blocks in the yard for the past 20 years -- have heavy brass radiators.
You'll need a truck to get the metal to the scrap yard, but once there, it's a quick process. The scrap yard weighs your truck when it's fully loaded and a large magnetic crane lifts the scrap from the back. Your truck is weighed a second time and the weight difference and payment amount are recorded on a slip of paper; you get your cash immediately from a special on-site ATM [source: Didorosi].