Amazon.com and eBay.com feature a number of used lawn tractor replacement parts. These parts include air filters and replacement belts. Prices for these parts can range from $1 to upwards of $50 as of 2015.
Amazon.com has over 1000 used tractor parts for sale. The prices start very low and can go up to about $600. The site features trimmer heads, valve replacements and many other varieties of used tractor parts. EBay offers more than 3,000 used tractor parts for sale. Like Amazon.com, eBay offers those used lawn tractor parts in prices ranging from $1 to upwards of about $1,000.