ironmind's vulcan racks are $409... The Werksan is a heavier gauge stock and I like the curved entry piece. i've seen racks for pretty cheap--maybe $250 or so--but the quality is questionable. Others are more.
Of course, if you don't need it to be adjustable, this is the way to go:
http://www.mikesgym.org/wod/images/karchutsqtrks.jpg