A whole brand new powertap wheelset is at performance bike for $1100, or you can find older powertaps on slowtwitch as has been mentioned. Of course, if you have 0 posts over there, you can't send PM's and people may be reluctant to ship you a $600 item.
All the "steals" for new powertaps are done and gone, the opportunity for that has been missed. They were blowing out the previous gen during that time.