Customers can buy used inboard boat engines at Remanufactured.com and Alibaba.com. As of November 2015, these companies have boat engines in stock; however, with used engines, stock is constantly changing.
At Remanufactured.com, customers can find inboard longblock engines, turnkey engines and performance engine upgrades. Brand name engines include Ford, Sea Maxx, Volvo Penta, Master Craft and many others. The main page of the website shows all of the engines currently available for sale, along with pricing, brand and year of manufacturer.
Alibaba.com offers a variety of boat engines for sale, many of them diesel-powered. This website provides a variety of filters when searching for an engine, allowing users to search by cylinders, fuel types, engine capacity and a few others.