If you want to get your own greenhouse it can be easy to do.
First decide how you will use it (to winter over plants, get an early start on seeds, grow cool or warm weather crops, or a combination), and find out what greenhouse will best work for your plants.
There are many different greenhouse kits to choose so it's important to read lots of information about greenhouse kits to make an informed decision and know your greenhouse is right for your area and your crop.
When looking for a greenhouse kit, you will also have to consider size.
Measure how big of space you have for the greenhouse (preferably in an area of your yard that gets southern exposure).
You may be fortunate to live on acreage and space is not an issue.
A majority of hobby greenhouse kits start at 8'x8' or 8'x12'.
Anything less than 8' wide does not give you much room to work comfortably in your greenhouse.
If you have a smaller space, there will be less kit options to choose from.
You may need to consider a custom designed unit and look for greenhouse covering options.
If you have never used a greenhouse before, you may find that a cold frame would work better for you until you know how you will use your greenhouse.
It will be less expensive and you can use it during two seasons to let you grow a bit longer out of the year.
This will give you the chance to see and learn how growing under cover can open up your growing possibilities.
What you choose is up to you.
There are many greenhouse kits and companies that are ready to help you along the way.
You just have to get online and find a greenhouse that works for you and fits in your budget.