Beauty is in the eye of the beholder.
Here's one thing to consider. Some of the carports have a rounded edge and no overhang. Some of them have an overhang. It makes a difference if you decide you want to add siding to it later. Without siding, your tractor still has some exposure to the weather and to UV rays.
I think you have to carefully shop around for what is in your market right now. I've seen lots of $695 shelters advertised, but then the price escalates with "options."
Installers will throw them up in record time. If you plan, however, to put siding or doors on it later, you'd better prepare a level site and work on the installers to put your carport up plumb and level or it will be a pain later to add anything else to it. They will put it up, but they won't do much, if any, site prep.
I think it goes beyond what you're asking about, but there have been some posts here about putting metal shipping containers on either side of prefab metal carport type structures that make a lot of sense to me.
Whatever you spend today, it will likely be more expensive to do the same thing in a few years. Just don't rush into anything and blow your budget before you figure out what you can get for your dollar today. I got by with a tarp for a while before building a wooden tractor shed with sawmill lumber.