cheapest and best google you can get is crowbars off tramdock.com. they sell them for 60+ percent off, so you could get a nice pair for 40. i have a pair and love them so much, they just have the quality that you would expect out of a top of the line brand like oakley. there is a wide variety of both google colors and lenses, to fit any style and type of day. eveeryone has them on NS it seems, so there are plenty of people always willing to trade you parts for a different look or a replacement. the periferal vision is also super nice, always able to see everything and with the double layer lens they don't fog easily either. here is a picture of mine, which look imo better than any other google out there.
also, here is a link to the thread were you can request what products go on sale at tramdock.com, because each product only goes on sale for 15 min at a time.
heres a link to tramdock: