Used Hummer listings are available on websites such as CarMax.com, TrueCar.com and Autotrader.com, as of January 2016. Additional sources include Cars.com and free classified services such as CraigsList.org. Hummer varieties found online include the large, diesel-powered H1, the newer H2 model and trimmed, less expensive H3.
CarMax.com and TrueCar.com provide filters that narrow results by options such as transmission, interior and exterior colors, package, fuel type and mileage. Autotrader.com offers the ability to browse Hummers that are certified (a pre-owned vehicle that has passed multiple safety and quality inspection points) and offered through a dealership. Because of the size and weight of the Hummer H2, owners with specific forms of income may be eligible for deductions under the United States income tax code, according to Wikipedia.org.