If someone were to ask you, I have 1 old car to replace, what would you tell them?

So before anyone can give you a reasonable suggestion you need to include more information about your current windows such as where you live and how large is the window that needs replacing. It also helps to know does is open or is it fixed? Why does it need to be replaced? Is the current window wood, or aluminum, or vinyl?

The more information that you provide, the best chance for you to get useable suggestions.