Used heavy duty tow dollies can be purchased online by visiting auction sites such as eBay or local classifieds sites such as Craigslist. Users can search listings to find the appropriate tow dolly and make payment arrangements directly with the seller.
Items sold on eBay are done so through either an auction model, which includes bidding and no guarantee of getting the item, or a traditional immediate purchase model. Buyers typically pay with PayPal when making purchases on the site. Craistslist does not handle payments itself, but instead leaves it up to buyers and sellers to work out an arrangement.