Brad Roberts has them on sale for $2115:
http://www.bradrobertsag.com/product/GM5-8847-HO/Bilstein-PSS9-Suspension-Kit--Boxster---04.html
He's a forum member. IMO, worth a few extra bucks to support guys that contribute to the community & are here to help if needed.
Brad also has the Boxster Spec 450/500 springs for the PSS9s.