Are you sure you got a quote for a replacement window? Andersen doesn't make replacements under the Andersen name. They do vinyl replacements as Silverline (American Craftsman at Home Depot) and replacements through their Renew line, which is an installation program.
My guess is you got a quote for a new construction. It is hard to say if your quote was high without knowing which line the person used.
My guess is you got a quote for a new construction. It is hard to say if your quote was high without knowing which line the person used.