There are no "tire laws" for used car dealers.
There are quite a few well known tire dealers. Kal Tire is one of Canada's largest tire dealers and provides services for retail and commercial vehicles. OK Tire also has many chain stores and provides a wide range of tires.
Newpaper ads from tire dealers carry coupons and also try researching through tire manufacturers for online discounts. Yellow pages call also assist you with tire dealers in your area.
A tire store
Most tire dealers don't use coupons, but sales. The best bet is to call around and comparison-shop.
Most tire dealers offer the best sales at the year end, usually after the holidays. You might also find sales around Memorial Day when people are preparing their vehicles for summer travel. Call around you area to the larger tire dealers and ask when the next big sale is. Often, they'll be happy to tell you.
Any auto dealers, auto specialty shops, Canadian Tire, Wal-mart, they all have reasonable prices of tire covers. Auto dealers usually sells them for more, because they are brand name products.
You can buy mud tires from a local tire dealers and from many online tire stores. Good thing to remember when buying mud tires is that cheapest isn't always the best.
Local tire dealers can be found in yellow book, however there are not many dealers that buy used tires. Your local mechanic or dealer would be able to give you the best deal to trade in tires. Large chains like Firestone only accept tires in exchange for discount on new tires if you are interested.
Do I have the perfect answer for you. A check of this week's advertisement has Tire Kingdom offering one hundred dollars off four tire.
Yes you can try. There is a Maine Tire Dealers Directory that is listed on this website: http://maine.uscity.net/Tire_Dealers/
All tire stores carry all weather tires. I have found from the littliest family owned business, to the giant online sources, or the warehouse stores. All tire dealers carry all weather tires. Do a search of local tire dealers to find one that will direct you to the correct tire for your vehicle.