You will not find any on the open market due to security concerns. Used trucks that are no longer serviceable are crushed or otherwise destroyed.
One can find military trucks for sale on site such as eBay. One can also find military trucks for sale on Military Trucks, TNJ Murray and many other places.
One can find mining trucks for sale at a variety of different truck dealerships. Some of the places that one can can find mining trucks for sale are: Rock and Dirt, Siemens, and Chevy.
You can check out the Craigslist in your area for trucks for sale. You can search by price, so you can find the trucks in your price range.
If you look online through Google, you will find that Carmax and Ebay have good listings of cheap trucks for sale.
You can find Sterling trucks for sale using the dealer locator on the official Sterling Trucks website. You can also find them from personal sellers on the auto section of the eBay website.
The Hess Mini Trucks go on sale on Memorial Weekend. You can find them for sale online and have them shipped to your door
Freightliner Trucks can be found for sale at specialized websites and even in some stores. Some websites you can find Freightliner trucks on include fleetsalesonline and freightlinertrucks.
There are lots of places online where someone can find old trucks for sale. Some of these sites are: FossilCars, U-Haul, carsforsale, Autotrader and Trucks for a Grand.
The best places to find used bucket trucks for sale online are through autotrader.com and ebaymotors.com. Also check http://vehicles.oodle.com/used-vehicles/for-sale/bucket-trucks/.
Depending on the types of trucks you are looking for, you can find trucks at http://www.penskeusedtrucks.com/. You can also find trucks at http://www.buyatruck.net/
Finding automobiles or trucks that are for sale by owner can be found in local newspapers or thrifty-nickles. You can also find for sale by owners in the craigslist of your local town and state.