Used Dodge Ram seats can be purchased from a range of online marketplaces such as eBay as of March 2015. An alternative is to purchase a cheap Dodge Ram from a site such as AutoTrader.com and use the seats as replacements.
One of the options available on eBay is the 2013 Dodge Ram 3500 Longhorn Seats. The listing of $1,300 includes the complete set of front and back seats. Individual seats and seat parts are also available, including the driver side bottom seat cushion for the 2003 Dodge Ram. Used Dodge Ram trucks, however, can be purchased for as low as $1,000 to $1,300.