I bought spokes at Wiggle.co.uk
Sapim CX Ray Aero Spokes Silver Pack of 20 (278ìì) $50
Sapim CX Ray Aero Spokes Silver Pack of 20 (280ìì) $50
Build and measured by LBS, works flawlessly 
FLO 30 rear final weight with Powertap G3 935g
New Powertap G3 hub $625(ebay)
Flo30 $274
P.S, I have plenty of spare spokes.