Purchase replacement scraper blades for a tractor from farm equipment companies such as Land Pride, Tractor House and Rhino. Online auction websites such as eBay also sell used and new scraper blades. If you want to find a nearby seller, check the farm and garden section of your local Craigslist.
Some tractor dealers also carry replacement scraper blades. If the blade you need is not in stock, a dealership may be able to order it. For smaller tractors, check farm and garden supply stores. The classified ads of your local newspaper may also feature replacement blades in the farm equipment or miscellaneous sections.