A store that sells a tractor cab is Sears. For example under the topics Lawn and Garden and Tractor attachments, listed is a Craftsman brand Tractor Cab.
Need to be a little more specific here.... I wouldn't direct you to the same place to purchase a Volvo cab as I would send you to purchase a Peterbilt cab. You need to give an idea of what exactly you're looking for.
A snow tractor is called a sculpture made from snow.
semi cab
A conventional tractor is what much of the world outside of North America refers to as a "bonneted" or "hooded" tractor. It has a hood which extends out in front of the cab. This is in opposition to a COE (cab-over-engine) tractor, where there is no hood.
Attaching a snow blower to your tractor can be a very effective way of heavy snow removal. The company Berco make a snow blower that is made to attach to your tractor. It has received great reviews.
300 pounds
You can identify a Massey Ferguson tractor because it has a red cab and bonnet and grey wheels.
in the cab by the brake
yes
One can purchase a Ford N9 tractor from various sources. Some of those sources are Tractor House, Phils Tractor, Kijiji, Craigslist, Tractor Works and Homestead.
day cab is a truck with no sleeper, just a standard cab