You can check out these web sites:

http://www.agromachine.com/used/Agriculture/Harvesters/Combine-Harvester/8/34/search
or
http://www.agriaffaires.co.uk/used/1/combine-harvester.html

To purchase and manage via google use keyword: buy combine harvester/parts

You can also get tips on:

http://resources.alibaba.com/topic/800109357/Tips_to_buy_corn_combine_harvester.htm

good luck!!!!

In differnt states and countries they have machines that are invented to do certain things. Some places have laws to protect from certain polutions or disturbences. Like noise. Make sure you buy a machine that fits your locations needs. Don't buy a wrong one and make sure you check your cities laws and regulations. If in need register your item and go through the safty check. If you want you can even get the chrome rims. Have a great time shopping and save money for shipping and handling.