DevL,
Try Galls. They carry Oakley SI products:
[url]http://www.galls.com/style.html?style=EW098&assort=general_catalog[/url]
You definitely can't go wrong with Oakleys. They are 100% optically correct meaning there is NO distortion through the lens and they exceed the ANSI Z87 specs. Oakley reps have a pretty cool laser device to demonstrate their optical clarity. They aim a laser through an Oakley lense and it 'hits' the target dead center. They then place a competitor's glass on this and you can visibly see the laser deviate. to get this clarity, Oakley actually starts with a lens blank this is almost 3 times the size of the finished product.
In regards to ballistic protection, I have seen Oakley lenses shot with a 12 gauge at approx. 10 feet and there was absolutely no penetration.
They are expensive, but you do get what you pay for!! Also, the iridium lenses do scratch fairly easiliy, but you can always pick up the non-iridium colors, which, IMHO, are much more suited to field work, anyway.
DevL,
Your other option would be an AAFES Clothing Sales store. I was at Offutt the other day and noticed they were carrying standard and SI Oakelys in Clothing Sales. Prices seemed reasonable.
One more option would be, if you are Military/LEO and have some teammates who would like to purchase would be to contact Oakley's Government sales team and arrange a 'group buy' through them direct. Probably better prices than anywhere.
Good luck!
I am in no way affiliated with Oakley, but have sold many, many pairs of them over the years to LEO and bicycle enthusiasts.