I picked up a pair of the Bolle off of Amazon last winter and they worked great. Had to put some of the Cat Crap stuff on them to keep them from fogging up. This year I picked up a pair of ATV goggles to try out. They were $12 at Gander Mountain. They are smaller than the Bolle and give a better field of view. It hasn't gotten below 30 for any of my rides yet. I'll see how they are when it gets really cold.
Steve.