* Craigslist
* eBay
* Facebook Marketplace
* MachineryPete.com
* TractorHouse.com
* EquipmentTrader.com
* AgriTrader.com
* FarmLink.com
Dealer Websites:
* John Deere
* Kubota
* Massey Ferguson
* New Holland
* Case IH
* Caterpillar
Local Farm Supply Stores:
* Co-Op
* Agway
* Farm & Fleet
Farm Auctions:
* Local and state auctions
* Online auctions (search "tractor auctions")