Mine was the small gray handle just above my left ear on the drivers side. I pulled it half way down and the noise stopped. It's only done it once again in the 9 months of ownership.

Another I found was the sun shade mount on the drivers side. I touched something in that area that stopped it and never heard it again.

Check for coins in the coin slots or trays. Check the tire cover hold down, make sure it's snug.

Fold down the rear seat and see if it's any louder.