A "basic " knot runs around $1300 US. You could find one gently used on the *bay for $850-1200. I don't know retails on this one but my guess is your price is ok.
The Knot has an iconic quality to it. Is it essential in a woman's closet? Probably not. But are those that have one very glad they do? You betcha! It's ultimately your decision, Do you think it's worth it?