Anon Informant - Yvonne Strahovski - Chuck
The Anon sunglasses can clearly be seen in Season 1, Episode 11, 'Chuck Versus the Crown Vic'. Click on the photos to see a larger version. The little engraved Anon logos on the side of the arms (in the gold part) are clearly visible.
These Anon Informant sunglasses come in different color combinations and had a suggested retail price of $125 but are currently not available anymore.
Thanks to Michael for the ID
Reference: Anon sunglasses, Gold frame, brown gradient lenses