Check your local craigs-list and if you find something that looks like a good deal ask if you can bring some gas and an electric heater to run it to see that it works before you buy it. Don't forget to check the oil before you start it. Sometimes they are new in the box and have never been ran. And sometimes they were ran without oil. You can find everything from a sweet deal to an abused piece of junk so you have to test them carefully. It might be a good idea to also bring oil, just in case it is new and never used.