I have 2 pair of rx Oakleys, but have not even considered spending $600 for Oakley lenses. Find a good optical shop that cuts their own lenses; the best machines now can do anything.
For the last ones I had made, I bought the frames on the bay--cheap--got a discount eye exam at Costco, and had the lenses tinted and put in at the optical shop with the latest equipment, out the door for less than $200 without insurance. The frames I bought didn't even have the plastic demo lenses in them to trace the pattern and these guys had no problem with it, though most optical shops will tell you it can't be done. The first pair of Gascans they made me a couple of years ago are still in great shape. Got them done in the $200 range with insurance which included the frames from the shop.