Opal pressure pool

Are replacement windows always this expensive? - replacement to expensive chinchilla sand

My house has aluminum windows and think inefficient'm replace old ones. He was a salesman for Champion Windows, because that "40% off sale (Yeah right! Lol) I thought it would be about $ 600 out the window for a discount of 40% ... $ 1000 out the window before the start! Is that what you would expect from other companies? If it is so expensive, we need to simply buy and install Windows from Lowes us.