Would $450 be any better for you? It's really in pristine shape, and I know the included compression bag will totally seal the deal ;)
Just off the top of my head, $200 off the new price is about 30%, which I think is as good as you'd ever get on sale for WM. If I'd had more use out of this bag, I'd be willing to go lower, but it's only been in the field for one trip and has been hanging up in my room ever since.
Let me know... and thanks for the reply.