Several online retailers and auction sites, including eBay.com, Marinepartsexpress.com, Usengine.us and Boattrader.com, sell new and used Volvo boat engines. As of 2015, the prices generally range from $1,200 to $8,000. The most commonly listed engine is the Penta.
EBay.com features a variety of Volvo boat engines including Penta outdrive, diesel, prop and inboard. The website lists both new and re-manufactured engines.
Marinepartsexpress.com sells new and used Volvo boat engines with one- and two-year warranties. The site lists both gasoline and diesel engines.
Usengine.us offers Volvo Penta engines manufactured from the late 1970's until 2007. The site lists both four-cylinder and six-cylinder models.
Boattrader.com offers both new and used engines for sale, though its site tends to have fewer listings than some others.