Is your bike still in warranty? If so contact John at oxygen bikes who will likely give you some for free. They replaced two broken spokes (snapping 2 more in the truing process), and then gave me 6 to take home (which I've used) with me for free.
I suspect/hope I'm a one off (bike snapped another 2 recently, back wheel going back to them Monday), but it would be useful for them to know if others have a problem.