You may look on multiple sites such as kijiji.com or your local dealers. Maybe try Autotrader you are sure to find tractor tires for sale. Tractor tires aren't sold everywhere since there not that big of a market for it. Ask your neighbor farmer if they know a good source.
Check any online store to be honest. Johndeere.com has a great selection if you have a john Deere tractor or lawn mower.
do you have any sales on tires?
There are several sites online that offer used tractor tires. You could also try any farms in your area. If they have a tractor, they may have the old tractor tires saved from previous uses.
Stores such as John Deere will carry any and all John Deere tractor tires in stock. Tractor House also carries a variety of John Deere tractor tires in stock.
As with any kind of sale, the phrase "let the buyer beware" should always be kept in mind. With tractor tires the buyer should always look for signs of previous use and especially pay attention to damage in the tire or the wheel. Lack of pressure is also an indicator of a problem.
Any tire made for Tractors will work fine with the John Deere Tractor. Just be aware of the size of your tractor so you can be aware of what size tires you will need to put on the tractor itself.
Apparently many people feel that it not only saves money but time also if you fix your tractor tires yourself. There is a step by step guide on how to at this website http://www.tractorbynet.com/forums/kubota-owning-operating/138901-can-anyone-tell-me-how-2.html. Also you can buy tires for your tractor at any of these websites farmlandtractor.com, tractorpartsasap.com and colemanequip.com.
Stores such as JOHN DEERe will carry any and all John Deere tractor tires in stock. Tractor House also carries a variety of John Deere tractor tires in stock.
You could find used tractor tires at any hardware store such as Home Depot or at a tractor specializing store such as John Deere or the like. Also, people in your area may be selling tires.
If you need to get tractor tires, it is very important that you get them used. This saves a lot of money because new tractor tires cost--as you probably know--lots. However, you will have to go over the exterior of the tires to make sure there aren't any leaks. Maybe ask to try out the tires before you buy them. Then you can get a sense of any leaks and how serious they are. Ask lots of questions about whatever you are wondering about. Knowledge is power and you will have to understand the product in order to save money.
Any fluid in tractor tires adds weight to the tire/tractor, thereby adding better traction. An Anti-freeze type fluid should be used instead of water in cold climates where outside air temps drop below freezing.
Some tire stores may have tractor tires. Stores like Home depot are also a good place to buy replacement tires. Check with the nearest locations first then go to a specialty store.