I've been following these for a while and that's the cheapest I've seen them. Oakley store (AU) has them for $299.99 (non-polarized). Amazon US was cheaper, but wouldn't ship to Australia. My best google search was ~$237
Now, I know people have quite polarized (hehe) views on Oakley sunnies in general, but I think it's a pretty good price.
Just a sidenote, I went in to have a look yesterday, and the polarized version wasn't available in-store. Rep said there is stock at warehouse though.
http://www.probikekit.com/au/clothing/cycling-clothing/eyewe…
free delivery too…