I purchaed mine at bavauto.com -- $400 for the front and rear set. Despite what the description or pictures show, the rear bar does not come with new adjustable end links unfortunately. I would recommend picking up an upgraded set of end links from turnermotorsport.com, because the added torsion of this new sway bar kept snapping my stock end links.
You'll feel a difference immediately once they are installed -- cornering feels significantly flatter and controlled. Visually comparing these hotchkis bars side-by-side with the stock bars, is like comparing a drinking straw with a spaghetti string.