I used these guys a while ago and thought I might share this with everyone here.
I purchased a pair of prescription sunglasses with Drivewear lenses in them and got them delivered for $113, I was quoted $580 just for the lenses locally.
They are really great quality, perfect prescription. All you need to do is grab your prescription from your optometrist and fill it out on the site when you order. Takes around a week for the glasses to be made and another 2 weeks for the Glasses to turn up.
The code I have included will give you 20% off your order.