James Carpinello wears a pair of tortoiseshell Ray-Ban 2132 New Wayfarer sunglasses in the film Let's Kill Ward's Wife.

The sunglasses worn in the film have Polarized glasses (as the little "p" next to the Ray-Ban logo on the lens shows), and have a tortoise frame.

Get the New Wayfarer in tortoise or other colors on Amazon.com or Amazon.co.uk. 

Also available at the official Ray-Ban website.

Reference: Ray-Ban RB2132 New Wayfarer tortoise frame, polarized lenses