You must be from the UK since you are using the UK oakley website, so if i have one piece of advice for you: BUY GOGGLES FROM USERS OF THIS SITE.
I just got a pair of I/OS's for £60, they retail for 140. brand new, tags still on. Look in the Buy/Sell/Trade section for a few days and some brand new crowbars will pop up. They will probably be 60 - 80$, and then add $15 for shipping to the uk - half price compared with the UK.
I cannot stress this enough, do not buy from the uk store it is horrendously overpriced.