Log splitters are available through postings on classified ad websites such as Craigslist or in the classifieds section of local newspapers. Many flea markets or garage sales, especially in rural areas, have used log splitters for sale.
On the Craigslist page for your area, type "log splitter" into the search bar to find log splitter postings. Sellers usually list log splitters in the For Sale section under Farm & Garden, Heavy Equipment, or Tools.
Be careful when dealing with sellers, and thoroughly check machinery to make sure it is in working order. Craigslist advises buyers to always deal with sellers in person, to never give out financial information and to never send money sight-unseen.