Do you know of any really great international flight deals, beyond what googling "cheap flights" discovers?

Because of the completely crazy deportation of my partner from the US to Aus, I’m flying from California to Australia next month to visit, and am trying to do this as cost effectively as I can. I’ve used all the usual sites (Kayak, CheapOAir, Orbitz, etc) and am wondering if YOU know about some awesome website or special thing!