you will find them listed on your local craig's list and Ebay
price will vary based on the mileage and condition of the truck. the diesels will be more expensive, but will last longer.
prices can start at as little as $4,000.
if you take to a chevy owner he will tell you to buy chevy, same goes for a dodge owner (buy a dodge) either make in goo shape will work well for you.
hope this helps