My search for prices would start in the source I intend to use. If you are going to sell locally, I'd look at Craig's List, if you plan to list on eBay I'd look there. One thing you need to keep in mind with online sales is to look at machines that have actually sold. You can ask anything you want, it doesn't mean anyone will buy it. Looking at the prices of machines that have sold will give you a good idea of what someone will pay for it.