When looking for affordable windows, it is important to consider the quality of the glass, the frame, and the insulation. You usually get what you pay for, so it is important to do your research before making a purchase.
There are several good options for inexpensive windows. Vinyl windows, aluminum-clad wood windows, and fiberglass windows are all good choices because they have good thermal insulation and weatherproofing. Just be sure to compare prices between different brands and models to find the best deal.